How do you evaluate $2x^4$ when x = -1?

Question

2111 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2015-06-19T18:13:29

If $x=-1$ then:

$2x^4 = 2 * ((-1)^4)$

$= 2 * (-1) * (-1) * (-1) * (-1) = 2$

Exponentiation has higher precedence than multiplication, so first raise $-1$ to the fourth power, then multiply by $2$ .

How do you evaluate 2x^42x^4 when x = -1?