IMPORTANT MATHS FORMULAE FOR CLASS X …

IMPORTANT MATHS FORMULAE FOR CLASS X BOARD EXAM 2018 IGNORE MAAT KARNA DUM KE PADH KE JANA 28 TARIKH KO MATH EXAM HE BEST OF LUCK TO ALL MY FRIENDS. Algebra: (a + b)2 = a2 + 2ab + b2 (a – b)2 = a2 – 2ab + b2 (a + b) (a – b) = a2 – b2 (x + a)(x + b) = x2 + (a + b)x + ab (x + a)(x – b) = x2 + (a – b)x – ab (x – a)(x + b) = x2 + (b – a)x – ab (x – a)(x – b) = x2 – (a + b)x + ab (a + b)3 = a3 + b3 + 3ab(a + b) (a – b)3 = a3 – b3 – 3ab(a – b) (x + y + z) 2 = x2 + y2 + z2 + 2xy + 2yz + 2xz (x + y – z) 2 = x2 + y2 + z2 + 2xy – 2yz – 2xz (x – y + z)2 = x2 + y2 + z2 – 2xy – 2yz + 2xz (x – y – z)2 = x2 + y2 + z2 – 2xy + 2yz – 2xz x3 + y3 + z3 – 3xyz = (x + y + z)(x2 + y2 + z2 – xy – yz -xz) x2 + y2 = 1212 [(x + y)2 + (x – y)2] (x + a) (x + b) (x + c) = x3 + (a + b +c)x2 + (ab + bc + ca)x + abc x3 + y3 = (x + y) (x2 – xy + y2) x3 – y3 = (x – y) (x2 + xy + y2) x2 + y2 + z2 -xy – yz – zx = 1212 [(x-y)2 + (y-z)2 + (z-x)2] Linear Equation: Linear equation in one variable ax + b = 0, x = – −ba−ba Quadratic Equation: ax2 + bx + c = 0 x = −b±b2−4ac√2a−b±b2−4ac2a Discriminant D = b2 – 4ac Trial and error method In step 2 : take a product of ‘ Common terms’ as their HCF. In step3 : Take the product of All the terms, Omit the HCF value which gives you the value of LCM. Product of LCM* HCF=Product of the two polynomials Note: If cubical expression is given, it may be factorized by using ‘trial and error’ method. Remainder theorem: If (x-2) is a factor of the given expression, then take x-2 = 0 , therefore x = 2 , then substitute this value in p(x) = 5 x*x + 3 x-6 P(2) : 5(2*2) + 3(2)-6 =0 (here taking = 0 is very important. If not taken, answer can’t be found) If (x-2) leaves a remainder of 4 P(2) : 5(2*2) + 3 (2)-6 =4 ( Here taking = 4 is very important. If not taken, answer can’t be found) Linear equations in two variables If pair of linear equation is : a1 + b1y +c1 =0 and a2x + b2 y + c2=0 Then nature of roots/zeroes/solutions : i. If a1/a2 is not equal to b1/b2 then, system has unique solution, is consistent OR graph is two intersecting lines ii. If a1/a2 = b1/b2 is not equal to c1/c2 , then system has no solution, is inconsistent OR graph is parallel lines. iii. If a1/a2=b1/b2=c1/c2, then system has infinite solution, is consistent OR graph are coincident lines. Quadratic Equations Note: To find the value of ‘x’ you may adopt either ‘splitting the middle term’ or ‘formula method’. X=( -b +-(D)^.5)/2a (where D= b*b – 4ac) Hence x= (-b+- (b*b- 4ac)^.5)/2a Sum of the roots = -b/a & Product of roots= c/a If roots of an equation are given, then : Quadratic equation : x*x – (Sum of roots).x + (product of the roots) =0 If Discriminant > 0, then the roots are Real & unequal or unique, lines are intersecting. Discriminant = 0, then the roots are real & equal , lines are coincident. Discriminant< 0 , then the roots are imaginary (not real), parallel lines Triangles: If two triangles are similar then, ratio of their sides are equal. i.e if triangle ABC~ triangle PQR then AB/PQ = BC/QR = AC/PR If triangle ABC ~ triangle PQR then (Area of triangle ABC)/ Area of triangle PQR) = (side*side) /(side*side) = ( AB*AB) /( PQ*PQ) =( BC*BC)/( QR*QR) = (AC*AC)/ (PR*PR) Trigonometry: Wherever ‘square’ appears think of using the identities sin^2(x) + cos^2(x) = 1 tan^2(x) + 1 = sec^2(x) cot^2(x) + 1 = csc^2(x) tan(x+ y) = (tan x +tan y) / (1 – tan x tan y) sin(2x) = 2 sin x cos x cos(2x) = cos^2(x) – sin^2(x) = 2 cos^2(x) – 1 = 1 – 2 sin^2(x) tan(2x) = 2 tan(x) and many more are there if u want then I will send u an URL thank-you best of luck?????????

What is respiration.

This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

Few rules to keep homework help section safe, clean and informative.

• Don't post personal information, mobile numbers and other details.
• Don't use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.
• Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.
• Ask specific question which are clear and concise.

Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

Obtain the relation between incidence angle, emergence angle, prism angle and deviation angle for refraction through prism How to derive this

A current of 5 mili mpr is passing through a wire how many electrons are passing through per minute through the area of cross section of the wire

Explain three stages of resource planning

What is the importance of variation explain in 4 to 5 points

Digestion is begin from in the presence in which enzymes or digestion occur

How do organisms obtain their nutrition?

What is the function of petal and sepal.

How does our body respond when adrenaline is Secreated into the blood