Question

10.04] What is the exact value of the expression the square root 72. − the square root of 8. + the square root of 128.? Simplify if possible.

8the square root of 2.

12the square root of 2.

8the square root of 3.

12the square root of 3.

[10.04] What is the exact value of the expression 6the square root of y to the eighth power. − the square root of 9 times y to the fourth power. + 3the square root of y to the eighth power. − the square root of y to the fourth power.? Simplify if possible.

y4

9y4 − 4y2

3y4 − 10y2

y2

Answer 1

this hurts my eyes...use math symbols, dont write everything out

Answer 2

\[\sqrt{72}-\sqrt{8}+\sqrt{128}=6 \sqrt{2}-2 \sqrt{2}+8 \sqrt{2}=12 \sqrt{2} \]

Answer 3

basically you are simplifying radicals by pulling out perfect squares
use propertys:
\[\sqrt{m*n} = \sqrt{m} \sqrt{n}\]
\[\sqrt{m^{2}} = m\]

Answer 4

so whats the answer