Instructions

What will come in place of the question mark (?) in each of the following questions ?

Question 130

$$(25)^{3}\times(4)^{3}-800^{2}=(?)^{2}$$

Solution

Expression : $$(25)^{3}\times(4)^{3}-800^{2}=(?)^{2}$$

=> $$(100)^3 - (800)^2 = (x)^2$$

=> $$(x)^2 = 1000000 - 640000 = 360000$$

=> $$x = \sqrt{360000} = 600$$

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