Question

for the polynomial mx²-x+2 if p(-1)=7 then find m​

Answer 1

p(x) = mx2 – 2x + 3

∴ p(- 1) = m(- 1)2 – 2(- 1) + 3

∴ 7 = m(1) + 2 + 3 …[∵ p(-1) = 7]

∴ 7 = m + 5 ∴ m = 7 – 5

∴ m =2

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