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Expansion of (a ± b)²

Question 37In...

Question

Question 37

In the question given below, fill in the blank to make the statement true:

$(a - b)$ ___ $= a^{2} - 2 a b + b^{2}$

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Solution

$(a - b)$
We know that, $(a - b) (a - b) = (a - b)^{2}$
$= a^{2} - 2 a b + b^{2}$ $[∵ (a - b)^{2} = a^{2} - 2 a b + b^{2}]$

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Expansion of (a ± b)²

Standard IX Mathematics

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