Question 51

Find the value of x in $$\sqrt[3]{15625} - \sqrt{x} = 4$$

Solution

$$\sqrt[3]{15625} - \sqrt{x} = 4$$

$$=$$> $$\sqrt[3]{\left(25\right)^3}-\sqrt{x}=4$$

$$=$$> $$25-\sqrt{x}=4$$

$$=$$> $$\sqrt{x}=25-4$$

$$=$$> $$\sqrt{x}=21$$

$$=$$> $$x=21^2$$

$$=$$> $$x=441$$

Hence, the correct answer is Option B

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