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