Question

Which choice is equivalent to the expression below?
√28+8√7

A.8√35
B.12√7
C.10V7
D.9V35

Answer 1

$\sqrt{28}+8\sqrt7=\sqrt{4\cdot7}+8\sqrt7=\sqrt4\cdot\sqrt7+8\sqrt7=2\sqrt7+8\sqrt7=10\sqrt7\\\\Answer:C.$

Answer 2

$\sqrt{28}+8\sqrt7=\\ 2\sqrt7+8\sqrt7=\\ 10\sqrt7$