Question

When 3 is substituted for x, in the equation y=x2-4 what is y.

Answer 1

y=5

Explanation:

Substitute 3 in for x

y=x^2-4

y=(3^2)-4

Find the exponent first

y=9-4

Subtract

y=5

Hope this helps! :)

Answer 2

y = 2

Explanation:

plug in the x value given, y = 3(2) - 4

simplify, y = 6 - 4

y = 2