Asked in PPSC, FPSC and other one-paper exams (compiled from unofficial resources).
Basic Arithmetic & Number SystemsSquare Roots and Cube Roots
If $A = \sqrt{5} + 1 + \sqrt{5} - 1$ and $B = \sqrt{5} - 1 + \sqrt{5} + 1$, then $A + B$ is equal to:
- A.$4\sqrt{5}$Correct answer
- B.$2\sqrt{5}$
- C.$4\sqrt{5} + 2$
- D.$2\sqrt{5} + 2$
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Practice these MCQs in the appQuick fact: Simplifying $A$ and $B$ gives $A = 2\sqrt{5}$ and $B = 2\sqrt{5}$, so $A + B =$ $4\sqrt{5}$.