Question

Using the quadratic formula, find the solution to x2+6x+9=0
.

Answer 1

For x^2 + 6x + 9 = 0, a = 1, b = 6, c = 9. The quadratic formula gives

x = [−b ± √(b^2 − 4ac)]/(2a) = [−6 ± √(36 − 36)]/2 = [−6 ± 0]/2 = −3.

So the equation has a repeated root x = −3.