SOLUTION: use the quadratic formula to solve the following quadratic equations. a. 3x^2+2x-8=0 b. 5x^2+7x=12 please help

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Question 6687: use the quadratic formula to solve the following quadratic equations.
a. 3x^2+2x-8=0
b. 5x^2+7x=12

please help
Answer by ichudov(507)   (Show Source): You can put this solution on YOUR website!
I'll do one and you do another, okay?
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=100 is greater than zero. That means that there are two solutions: .




Quadratic expression can be factored:

Again, the answer is: 1.33333333333333, -2. Here's your graph:
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