Question
Subtract:
$a^2-b^2$ from $b^2-a^2$
$a^2-b^2$ from $b^2-a^2$
✓
Answer
$=b^2-a^2-\left(a^2-b^2\right)$
$=b^2-a^2-a^2+b^2$
$=2 b^2-2 a^2$
$=b^2-a^2-a^2+b^2$
$=2 b^2-2 a^2$
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