Question

if -2 is a zero of P(x)=2x²-x+a, find the value of "a"​

Answer 1

Answer:

$- 2 \: is \: a \: zero \: of \: p(x) \\ p( - 2) = 0 \\ put \: x = - 2 \\ 2( { - 2)}^{2} - ( - 2) + a = 0 \\ 2 \times 4 + 2 + a = 0 \\ 10 + a = 0 \\ a = - 10$

Answer 2

Answer:

a = -10

Explanation:

$p(x) = 2 {x}^{2} - x + a$

-2 is a zero of polinomial

$put \: x = - 2$

$0 = 2 {( - 2)}^{2} - ( - 2) + a \\ 0 = 2 \times 4 + 2 + a \\ 0 = 8 + 2 + a \\ - 2 = 10 + a \\ 0 - 10 = a \\ a = - 10$

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