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For what value of k-4 is …

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For what value of k-4 is a zero of polynomial x2-x-(2k+2).

Posted by Shreya Ramteke 6 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Tripti Rawat 6 years, 7 months ago

Given that, -4 is a zero of the polynomial f(x) = x² - x - (2k + 2), so, we have
f(-4) = 0
{tex}\Rightarrow{/tex} (-4)² - (-4) - 2k - 2 = 0
{tex}\Rightarrow{/tex} 16 + 4 - 2k - 2 = 0
{tex}\Rightarrow{/tex} 18 - 2k = 0
{tex}\Rightarrow{/tex} 2k = 18
{tex}\Rightarrow{/tex} k = 9.

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Shreya Ramteke 6 years, 7 months ago

Please fast

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CBSE > Class 10 > Mathematics