Instructions

What approximate value will come in place of the question mark (?) in the following questions.? (You are not required to calculate the exact value).

Question 83

$$15.99\times9.89-\sqrt{624.89}-17.001\times1.99=?^{2}$$

Solution

Expression : $$15.99\times9.89-\sqrt{624.89}-17.001\times1.99=?^{2}$$

=> $$(x)^2 = (16 \times 10) - (\sqrt{625}) - (17\times 2)$$

=> $$(x)^2 = 160 - 25 - 34 = 101$$

=> $$x \approx \sqrt{100} = 10$$

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