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My question from chapter 4 that …

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My question from chapter 4 that is -Quadratic Equation 1. Is it possible to design a rectangular park of Perimeter 80m and area 400sq.m? If so , find it's length and breadth.

    • Posted by Nidhi Yadav 5 years, 5 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Yuvika Mourya 5 years, 5 months ago

    First u have to make two equations. In a rectangular Park perimeter =80m and area is 400m^2. So let the length be l and breadth be b. Then acc to given information we find first equation as 80=2l+2b after taking common 2 we get 40= l + b<-1. Now second equation will be 400= lb <-2. There are three methods substitution, elimination and cross multiplication. U can use any method but I think the better one is substitution method. In second equation we can write it as b =400/l now substitute b value from equation u will get your Ans now u can try. I am not going to tell u the Ans this the ncert bk question u can see from the solutions. Go ahead I hope u get the ans ?

    2Thank You

    Lucifer ? Morningstar? 5 years, 5 months ago

    P of rectangle=2(l+b)=80=>l+b=40=l=40–b....(१) A of rec=400 => l×b=400 ...(२) | | put the value of l in EQ (२) b²-40b+400=b²-20b-20b+400=> b(b-20)-20(b-20) => b=20m then,l=20 m

    1Thank You

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    Posted by Kanika . 1 week ago

    CBSE > Class 10 > Mathematics
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    Posted by Hari Anand 5 months, 1 week ago

    CBSE > Class 10 > Mathematics
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