Question

Which of the following could be a solution to x^2 = 400

a. -200
b. -20
c. 40
d. 100

Answer 1

b

Explanation:

Given

x² = 400 ( take the square root of both sides )

x = ±
`√(400)` = ± 20

Thus x = - 20 is a solution of the equation → b

Answer 2

a. -200

Explanation:

Square root both sides:

x = +/- 200

x = -200, 200

x = -200