What is (-2+sqrt(20))/2 ?

The solution to (-2+sqrt(20))/2 is -1+sqrt(5)

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simplify (-2+sqrt(20))/2

simplify

\frac{- 2 + 20}{2}

- 1 + 5

Decimal Notation

1.23606 \dots

Solution steps

\frac{- 2 + 20}{2}

20 = 25

= \frac{- 2 + 2 5}{2}

Factor out common term

2 : 2 (- 1 + 5)

= \frac{2 ( - 1 + 5 )}{2}

Cancel the common factor:

2

= - 1 + 5

15 \div \frac{5}{3}

(x - 1) \times (2 x - 3)

12 x^{3} - 4 x^{2} - 3 x + 1

\frac{1}{\frac{1 + 5}{2}}

1 - \frac{1}{cos ^{2} ( x )}