wrodriguez08040 wrodriguez08040

05-07-2016
Mathematics

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If f(x) = x2 − 1, and f(2a) = 35, then what could be the value of a ?

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olemakpadu olemakpadu

10-07-2016

f(x) = x² - 1

f(2a) = 35

f(2a) = (2a)² - 1 = 35

4a² - 1 = 35

4a² = 35 + 1

4a² = 36

a² = 36/4

a² = 9

a = √9

a = +3 or -3.

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