Answer
14y$^2$-8
Work Step by Step
Distribute the negative sign to the parentheses and then combine terms vertically.
$\qquad9y^2-6$
$\underline{-(-5y^2+2)}$
$\qquad\;\downarrow$
$\quad9y^2-6$
$\underline{\;+5y^2-2}$
$\quad14y^2-8$
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