Question

find the value of the following expressions, when x=-1,a)2x square -x-2​

Answer 1

Step-by-step explanation:

$2 {x}^{2} - x - 2 \\ put \: the \: first \: value \: x = - 1 \\ = 2 \times ( { - 1})^{2} - ( - 1) - 2 \\ = 2 \times 1 + 1 - 2 \\ = 2 + 1 - 2 \\ = 1 \\ put \: the \: second \: value \: x = a \\ 2 {a}^{2} - a - 2$

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Answer 2

Q) 2x^2-x-2
Subsistue the values x= -1
= 2(-1)^2-(-1)-2
= 2*1+1-2
= 1 Ans

Subsistue the secnd value x= a
= 2a^2-a-2
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