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Divide both sides of the equation by 2.
x2 = 20
Take the square root of both sides of the equation.
√(x2) = ±√20 (± applies to both roots, but there are only two different possibilities. Those can be arrived at by just putting ± on one side, usually the side with the constant. -x=-√20 is the same as +x=+√20)
√(x2) = x = ±√20 = ±√(22*5) = ±2√5
x = ±2√5
x2 = 20
Take the square root of both sides of the equation.
√(x2) = ±√20 (± applies to both roots, but there are only two different possibilities. Those can be arrived at by just putting ± on one side, usually the side with the constant. -x=-√20 is the same as +x=+√20)
√(x2) = x = ±√20 = ±√(22*5) = ±2√5
x = ±2√5
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