Question

i need help on these three questions (simplifying)
1) 3√20-2√45
2) 5√18+4√32
3) √12-7√75

Answer 1

Have you considered hunting for perfect squares?

20 = 4*5
45 = 9*5
18 = 9*2

Like that.

Answer 2

oooooooh okay, thank
you!

Answer 3

when i split them into perfect squares would i put the three on both sides? like 3√20=3√4 and 3√5?

Answer 4

\(3\sqrt{20} = 3\sqrt{4\cdot 5} = 3\sqrt{4}\sqrt{5} = 3\cdot 2\sqrt{5} = 6\sqrt{5}\)

Answer 5

thanks