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Multiply:
$(a-1)$ by $(0.1a^2 + 3)$
To do:
We have to multiply $(a-1)$ by $(0.1a^2 + 3)$
Solution:
We know that,
$(a+b)\times(c+d)=a(c+d)+b(c+d)$
Therefore,
$(a-1)\times(0.1a^2 + 3)=a(0.1a^2 + 3) - 1(0.1a^2+ 3)$
$= 0.1a^3 + 3a-0.1a^2-3$
$= 0.1a^3 - 0.1a^2 + 3a-3$
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