Question

Simplify the expression

7√7 - 2√28
A) 3 square root of 28
B)- square root 7
C) 5 square root of 28
D) 3 square root of 7

Answer 1

\[2\sqrt{28} = 2\sqrt{7 * 4} = 2 * \sqrt{7} * \sqrt{4} = 2 * 2 * \sqrt{7} = 4 \sqrt{7}\]

does this derivation help?

Answer 2

kind of, i may need more to understand though, im a detailed learner

Answer 3

me to @alexxkayee

Answer 4

if you agree with the derivation above, then the problem becomes

\[7 \sqrt{7} - 4 \sqrt{7}\]

see how this simplifies even more?