Question

Completely simplify any radical expressions.
5x2 = 40
a) x = 2 sqrt 3
b) x =2 sqrt 2
c) x = 2
d) x = 3

Answer 1

a) x = 2 sqrt 3

Answer 2

\[\large 5x^2=40\]\[\implies \large x^2 = \frac {40}5=8\]\[\implies \large x^2 = 8\]\[\implies \large x = \pm \sqrt8\]
\[\implies \huge x = \pm 2\sqrt2\]