[4] \dfrac{\left(489 + 375\right)^2-\left(489 - 375\right)^2}{\left(489 \times 375\right)}=?

For Competitive Exams

$\dfrac{\left(489 + 375\right)^2-\left(489 - 375\right)^2}{\left(489 \times 375\right)}$=?

144

864

Explanation:

Given Exp. =$\dfrac{(a + b)^2 - (a - b)^2}{ab}$=$\dfrac{4ab}{ab}$= 4

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