Question

7 over radical 90 write in simplist form

Answer 1

Simplify the square root
$7 \sqrt{90} = 7\sqrt{3 { }^{2} \times 10}$
Separate the numbers in the square root to look like this
$7 \sqrt{3 ^{2} } \sqrt{10}$
Because three is squared, it cancels out the square root
$7 \times 3 \sqrt{10}$
Simplify to get your answer:
$21 \sqrt{10}$