Use the formula - a-b a-b - a2 - b2 to evaluate - 7-7 - 8-3

7.7 × 8.3 = (8 0.3) × #160; (8 + 0.3) #160; = 8^2 (0.3)^2 #160; ( ∵ #160; (a+b)(a b) = a^2 b^2 ) #160; = 64 0.09 = ...

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Expansion of (x^2 - y^2)

Use the formu...

Question

Use the formula : $(a + b) (a - b) = a^{2} - b^{2}$ to evaluate :
$7.7 \times 8.3$

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Solution

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