Which of the following are solutions to the equation below ? 2x^2+18=20

x=±1

Step-by-step explanation:

1 Subtract 1818 from both sides.

2{x}^{2}=20-182x

2

=20−18

2 Simplify  20-1820−18  to  22.

2{x}^{2}=22x

2

=2

3 Divide both sides by 22.

{x}^{2}=1x

2

=1

4 Take the square root of both sides.

x=\pm \sqrt{1}x=±√

1

5 Simplify  \sqrt{1}√

1

  to  11.

x=\pm 1x=±1

Done