Question

PLEASE HELP! Square root related
5 (square root of 144 minus 2 times square root of 64)

Answer 1

`\huge\boxed{5(√(144)-√(64))=20}`

Explanation:

`√(a)=b\iff b^2a\ \text{for}\ a\geq0\ \text{and}\ b\geq0`

`5(√(144)-2√(64))=(*)\\\\√(144)=12\ \text{because}\ 12^2=12\cdot12=144\\√(64)=8\ \text{because}\ 8^2=8\cdot8=64\\\\(*)=5(12-8)=5(4)=20`