Question
Expand:$(5a - 3b)$ ${ }^3$
✓
Answer
$(5 a-3 b)^3$
$=(5 a)^3-(3 b)^3-3(5 a)^2(3 b)+3(5 a)(3 b)^2$
$=125 a^3-27 b^3-225 a^2 b+135 a b^2$
$=(5 a)^3-(3 b)^3-3(5 a)^2(3 b)+3(5 a)(3 b)^2$
$=125 a^3-27 b^3-225 a^2 b+135 a b^2$
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