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Question 15

The value of $$(25.732^{2}-15.732^{2})$$ is

Solution

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$$(25.732^{2}-15.732^{2})$$ 
= $$(25+0.732)^2-(15+0.732)^2$$
= $$25^2+50(0.732)+0.732^2-15^2-0.732^2-30(0.732)$$
= 400 + 20(0.732)
= 414.64

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