$\dfrac{\left(489 + 375\right)^2-\left(489 - 375\right)^2}{\left(489 \times 375\right)}$=?
144
864
2
4
Explanation:
Given Exp. =$\dfrac{(a + b)^2 - (a - b)^2}{ab}$=$\dfrac{4ab}{ab}$= 4
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$\dfrac{\left(489 + 375\right)^2-\left(489 - 375\right)^2}{\left(489 \times 375\right)}$=?
Given Exp. =$\dfrac{(a + b)^2 - (a - b)^2}{ab}$=$\dfrac{4ab}{ab}$= 4