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16-02-2018
Mathematics

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For f(x) = 2x + 8, find x when f(x) = -7.

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cdw2014 cdw2014

16-02-2018

-7 = 2x + 8

Solve for x. First subtract 8 to both sides.

-7 - (8) = 2x + 8 - (8)

-15 = 2x

Divide by 2.

-15/(2) = -2x/(2)

x = -15/2 = -7.5

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