Question

How many solutions are there to the equation below?

x²=9
A. 9
B. 0
C. 4
D. 2
E. 3
F. 1

Answer 1

D; only 2

Explanation:

Solve for x over the real numbers:

x^2 = 9

Take the square root of both sides:

Answer: x = 3 or x = -3

Answer 2

Answer: D) 2

Explanation:

x² = 9 means what number times itself is equal to 9

We know that 3×3=9 so that is already one solution, but there is another

-3×-3 is also equal to 9

A negative number times a negative number results in a positive number so -3 is another solution.

That gives us two solutions