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If 5 is the zero of x3+kx3+2x+8 find k

Posted by Singh Saab 7 years, 6 months ago

CBSE > Class 09 > Mathematics

3 answers

Sakshi Geeta 7 years, 6 months ago

Why -5 if 5 is zero so why we should put -5 stupid

0Thank You

Soumili Bhattachariee 7 years, 6 months ago

Let p(x)= x^3+kx^3+2x+8 Now, p(5)=5^3+k*5^3+2*5+8 =125+125k+18 =143+125k Here, 5 is the zero of the given polynomial. So, p(5)=0 Or, 143+125k=0 Or, 125k= -143 Or, k= -143/125. Hence, the value of k is -143/125.

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$N€H!L J@@T ? 7 years, 6 months ago

Put the value of -5 in the equation

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CBSE > Class 09 > Mathematics