Question

The value of polynomial 5x^4 +2x^2 -4 , when x =-1 is

Answer 1

3

Step-by-step explanation:

since -1 is raised by an even number it becomes 1

now,

$5(1) + 2 - 4 = 3$

because

$( - 1) {}^{2n} = 1 \\ where 2n \: is \: </strong><strong>an</strong><strong> \: </strong><strong>even</strong><strong> \: integer$