Question
Fill in the blank.$(b^2- a^2) - (a^2- b^2) =$ _____.
✓
Answer
$2b^2- 2a^2$.
$(b^2- a^2) - (a^2- b^2) =$
$(b^2- a^2) - (a^2- b^2)$
$\Rightarrow b^2- a^2- a^2+ b^2$
$\Rightarrow 2b^2- 2a^2$
$(b^2- a^2) - (a^2- b^2) =$
$(b^2- a^2) - (a^2- b^2)$
$\Rightarrow b^2- a^2- a^2+ b^2$
$\Rightarrow 2b^2- 2a^2$
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