Shawn K.

asked • 01/18/20# Quadratic Function

Solve x^2 - 12x = 0. I do not know how to solve this because there is no third term.

## 2 Answers By Expert Tutors

Arturo O. answered • 01/18/20

Experienced Physics Teacher for Physics Tutoring

You can also solve this using the quadratic formula. The "missing" third term is the constant c, which in this problem is zero.

a = 1

b = -12

c = 0

x = [-b ± √(b^{2} - 4ac)] / (2a)

x = (12 ± √144) / 2

x = (12 ± 12) / 2

**x = 0 or 12**

However, where possible, try factoring first. In this particular problem, factoring is very simple.

Ashley H. answered • 01/18/20

Math and Accounting Tutor

You don't actually need 3 terms to solve equations. Start by using the greatest common factor (GCF) of x to simplify things.

x(x - 12) = 0 GCF of x pulled out

x = 0 x - 12 = 0 setting both sections equal to 0 to solve

x = 0 x = 12 solving for x

2 solutions for this problem:

**x = 0, 12**

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Shawn K.

I forgot the 2nd "x." The actual problem is: X^2 - 12x = 0.01/18/20