How do you solve $2 x^{2} + 18 = 0$ $2x^2+18=0$ ?

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How do you solve $2 x^{2} + 18 = 0$ $2x^2+18=0$ ?

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Answer 1 · 2018-07-02T12:36:03

$x = \pm 3 i$ $x=+-3i$

Explanation:

$subtract 18 from both sides$ $"subtract 18 from both sides"$

$2 x^{2} = - 18$ $2x^2=-18$

$x^{2} = \frac{- 18}{2} = - 9$ $x^2=(-18)/2=-9$

$x = \pm \sqrt{- 9} = \pm 3 i$ $x=+-sqrt(-9)=+-3i$

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How do you solve $2 x^{2} + 18 = 0$ $2x^2+18=0$ ?

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How do you solve $2 x^{2} + 18 = 0$ $2x^2+18=0$ ?