Posted by **Kesha** on Monday, February 11, 2008 at 9:23pm.

How do I solve this quadratic function by finding square roots 2x²=200 ?

- ALGEBRA 2 PLEASE HELP -
**Anonymous**, Monday, February 11, 2008 at 9:27pm
Set it to 0

2x² - 200 = 0

Factor out the 2

2(x² - 100) = 0

Use difference of squares

2(x + 10)(x - 10) = 0

Solve for x

x = -/+ 10

- ALGEBRA 2 PLEASE HELP -
**Guido**, Tuesday, February 12, 2008 at 7:04am
Set the equation to 0 and solve for x.

2x^2 = 200

Divide both sides by 2.

x^2 = 200/2

x^2 = 100

Take square root of both sides.

x = positive 10 and negative 10

Always a positive and negative answer in terms of square roots.

Done!

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