Question

Solve 2x^2 = 5x + 4 using the quadratic formula. Round your answer to the nearest tenth

Answer 1

x1=-0.6
x2=3.1

Answer 2

x1 = 1/4 [ 5 - sqrt(57) ]

x2 = 1/4 [ 5 + sqrt(57) ]

Answer 3

First you have to rearrange the equation to equal 0.

2x^2-5x-4=0

The from this form, you know that ax^2 + bx + c = 0 so

a = 2, b = -5, c = -4

And then plug that into the quadratic formula \[X=\frac{ -b \pm \sqrt{b ^{2}-4ac} }{ 2a }\]