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

Maharashtra BoardEnglish MediumSTD 7MathsAlgebraic Formulae – Expansion of Squares2 Marks
Question
Use an expansion formula to find the values of : (1005)²
✓

Answer

iv. (1005)² = (1000 + 5)²
Here, a = 1000 and b = 5 (1000 + 5)²
= (1000)² + 2 x 1000 x 5 + 5²
…. [(a + b)² = a² + 2ab + b²]
= 1000000+ 10000 + 25
= 1010025
∴ (1005)² = 1010025

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