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