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Algebraic Expressions and Identities — MATHS STD 8 — Question

Gujarat BoardEnglish MediumSTD 8MATHSAlgebraic Expressions and Identities2 Marks
Question
Evaluate the following: $53 \times 55$
✓

Answer

Here, we will use the identity $(x + a)(x + b) = x^2+ (a + b)x + ab.$
$53 × 55$
$= (50 + 3) (50 + 5)$
$= 50^2+ (3 + 5) 50 + 3 × 5$
$= 2500 + 400 + 15$
$= 2915$

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