Algebraic Expressions and Identities — Maths STD 8 — Question
Maharashtra BoardEnglish MediumSTD 8MathsAlgebraic Expressions and Identities3 Marks
Question
Find the product:
$-5 a(7 a-2 b)$
✓
Answer
To find the product, we will use distributive law as follows:
$-5 a(7 a-2 b)$
$=(-5 a) \times 7 a+(-5 a) \times(-2 b)$
$=(-5 \times 7) \times(a \times a)+(-5 \times(-2)) \times(a \times b)$
$=(-35) \times\left(a^{1+1}\right)+(10) \times(a \times b)$
$=-35 a^2+10 a b$
Thus, the answer is $-35 a^2+10 a b$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.