If one of the zeroes of the quadratic polynomial 2x 2 + kx-10 is -4, find K
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Let p(x)=2x²+kx-10
If -4 is one of the zeros of p(x).
Then, p(-4)=0
Putting x=-4
2(-4)²+k(-4)-10=0
32-4k-10
22=4k
11/2=k
5.5=k
If -4 is one of the zeros of p(x).
Then, p(-4)=0
Putting x=-4
2(-4)²+k(-4)-10=0
32-4k-10
22=4k
11/2=k
5.5=k
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