SOLUTION: please help me solve this equation x(x+7)-2=28

Question 343508: please help me solve this equation x(x+7)-2=28
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
NEED TO KNOW:
TYPE OF EQUATION NEEDED TO USE THE QUADRATIC FORMULA TO SOLVE THE PROBLEM

x(x+7)-2=28
DISTRIBUTE AND SIMPIFY

Solved by pluggable solver: SOLVE quadratic equation with variable

Quadratic equation (in our case ) has the following solutons:

For these solutions to exist, the discriminant should not be a negative number.

First, we need to compute the discriminant : .

Discriminant d=169 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 3, -10. Here's your graph:

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