Question

Astudent says that if 5x^2=20 then x must be equal to 2. Do you agree or disagree with the student? Justify your answer​

Answer 1

disagree, x= 2 or -2

Explanation:

5x^2 = 20

Divide each side by 5

5x^2/5 = 20/5

x^2 = 4

Take the square root of each side

sqrt(x^2) = ±sqrt(4)

x = ±2

X could be either 2 or -2