Algebraic Expressions and Identities — Maths STD 8 — Question
Maharashtra BoardEnglish MediumSTD 8MathsAlgebraic Expressions and Identities2 Marks
Question
$(79)^2-(69)^2$
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Answer
Here, we will use the identity $(a-b)(a+b)=a^2-b^2$
Let us consider the following expression:
$(79)^2-(69)^2$
$=(79+69)(79-69)$
$=148 \times 10$
$=1480$
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