Question

Find the roots for f(x) = 2x2 - 8 :

Answer 1

Answer is x=2 or -2 and x=2 or -4

Answer 2

Answer:

x=2 and -2

Step-by-step explanation:

f(x)=2x^2-8

set the function equal to zero to solve for x

2x^2-8=0

add 8 to both sides and divide by 2

x^2=4

take the square root of both sides to get x isolated

√(x^2)=√4

x= ±2