Question
Subtract:
$-x^2-3 z \text { from } 5 x^2-y+z+7$
$-x^2-3 z \text { from } 5 x^2-y+z+7$
✓
Answer
Required expression:
$=\left(5 x^2-y+z+7\right)-\left(-x^2-3 z\right)$
$=5 x^2-y+z+7+x^2+3 z$
$=5 x^2+x^2-y+z+3 z+7$
$=6 x^2-y+4 z+7$
$=\left(5 x^2-y+z+7\right)-\left(-x^2-3 z\right)$
$=5 x^2-y+z+7+x^2+3 z$
$=5 x^2+x^2-y+z+3 z+7$
$=6 x^2-y+4 z+7$
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