Question

How do you solve `3x^2 + 18x + 15 = 0` by completing the square?

Answer 1

x = -1

Explanation:

Divide both sides of the equation by 3, which yields `x^2+6x+5=0`. Add 4 to both sides of the equation, which yields `x^2+6x+9=4`. This is done to make the left side `(x+3)^2`. Taking the square root of both sides yields `x+3=2`. Hence, `x=-1`.