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

Maharashtra BoardEnglish MediumSTD 7MathsAlgebraic Formulae – Expansion of Squares1 Mark
Question
Use the formula to multiply the following : $(3 x-5)(3 x+5)$
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Answer

Here, a = 3x, b = 5
(3x – 5) (3x + 5) = (3x)² – 5²
…. [(a + b)(a – b) = a² – b²]
= 9x² – 25

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