Question

one zero negative find k in 14x^2-42kx-9

Answer 1

Sol :
Let x be zero of the quadratic polynomial then -x is negative of the other.
∴ f(x) = f(-x)
Given f{x}=x2-8kx-9
x2-8kx-9 = x2+8kx-9
-8kx = 8kx
∴ k = 0 .
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