Answer:
q = ± 5
Explanation:
f(q) = q² - 125
to find the roots , let f(q) = 0 , that is
q² - 125 = 0 ( add 125 to both sides )
q² = 125 ( take square root of both sides )
q = ± = ± = ± ( × ) = ± 5
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= ± 
= ± (
× ) = ± 5