How do you solve 4x2=2x+8?

2 Answers
Oct 22, 2016

x=5

Explanation:

4x2=2x+8

Bring like terms to one side:

4x2x=8+2

2x=10

Divide both sides by 2:

x=5

Oct 22, 2016

x=5

Explanation:

4x2=2x+8

We eleminate 2x on the right by substracting 2x from each side.
Equivalently, we can add -2x to both sides.
4x22x=2x2x+8

Simplify
2x2=8

Add 2 to each side.
2x2+2=8+2

2x=10

Multiply each side by 1/2
2x×(12)=10×12

x=5

Check !

4x2=2x+8 substitute x=5 into equation

4(5)2=2(5)+8
202=10+8
18=18