Question

When x = - 1, what is the value of the polynomial 2x4 + 2x² + 5 ?


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Answer 1

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WE KNOW THAT, x = -1

THEN,

$2 {x}^{4} + 2 {x}^{2} + 5$

$= 2 {( - 1)}^{4} + 2 {( - 1)}^{2} + 5$

$= 2 + 2 + 5$

$= 9$

Answer 2

Answer:

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Step-by-step explanation:

Given :-

2x⁴+2x²+5 =0

If x = - 1 then

Solving :-

2x⁴+2x²+5 =0 substitute x value in the above equation we get

=>2(-1)⁴+2(-1)²+5

=> 2(1) + 2(1) + 5

=> 2+2+5 = 9

Conclusion :-

therefore the value of 2x⁴+2x²+5 if x = - is 9