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Algebraic Formulae – Expansion of Squares — Maths STD 7 — Question

Maharashtra BoardEnglish MediumSTD 7MathsAlgebraic Formulae – Expansion of Squares2 Marks
Question
Use the formula to find the values : 98 × 102
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Answer

98 × 102 = (100 – 2) (100 + 2)
Here, a = 100, b = 2
∴ (100 – 2) (100 + 2) = 100² – 2²
…. [(a + b)(a – b) = a² – b²]
= 10000 – 4
= 9996
∴ 98 × 102 = 9996

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