- Evaluate using expansion of a - b 2 or a - b 2 - -i 208 2 ii 92 2

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Algebraic Identities

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Question

$\begin{matrix} Evaluate using expansion of (a + b)^{2} o r (a - b)^{2} : \end{matrix}$
(i) $(208)^{2}$ (ii) $(92)^{2}$

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(a + b)^{2}

(a - b)^{2}

(208)^{2}

(a + b)^{2}

(a - b)^{2}

(92)^{2}

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

(a + b)^{2} - (a - b)^{2} = 4 a b

(92)^{2} - (91)^{2} = . . . . . . . . . .

a^{2}

b^{2}

16 b^{2} + 9 a^{2} = a^{2} b^{2}

36 b^{2} + 4 a^{2} = a^{2} b^{2}

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