SOLUTION: Solve (2x - 1)^2 = 20 Show every step

Question 295760: Solve (2x - 1)^2 = 20 Show every step
Answer by JBarnum(2146) (Show Source): You can put this solution on YOUR website!
show full problem
foil
add like terms
subtract 20

use quadratic formula

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=320 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 2.73606797749979, -1.73606797749979. Here's your graph:

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