SOLUTION: 2(8x+1)^2=90 Solve using quadratic formula

Question 536440: 2(8x+1)^2=90
Solve using quadratic formula

Answer by Maths68(1474) (Show Source): You can put this solution on YOUR website!

Divide by 2 both sides

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=11520 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 0.713525491562421, -0.963525491562421. Here's your graph:

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