Tuesday

March 31, 2015

March 31, 2015

Posted by **Peter** on Monday, October 5, 2009 at 9:01pm.

- Algebra -
**Reiny**, Monday, October 5, 2009 at 9:22pmYou probably have a something like this

(? ± √80)/??

so when you "break down" the √80 you would look for the largest perfect square which divides into 80. That would be 16

so √80 = √16 x √5

= 4√5 , which means 4 times the square root of 5

when you put that back into the formula expression you would of course keep the ±

get used to checking your work with a calculator.

find √80 and note its decimal answer

now find √5 , then multiply that by 4

You should get the same answer correct to about 8 decimal places, if not, you made a mistake.

**Answer this Question**

**Related Questions**

Algebra - Use the quadratic formula to solve the equation. Give exact answers: ...

Algebra - 69: 16x^2+8x-3. I inserted this into the quadratic formula and got -8...

Algebra - I used an online math site, to explain quadratic equations. But the ...

Algebra - Rationalize each expression by building perfect nth root factors for ...

Math simplifying mixed radicals - Please help me simplify these following mixed ...

Math - What is the square root of 12? 3.464 Well, that's true, but you could ...

algebra - 1.)correct 2.)wrong---> the first term is wrong 4(3a^2)^2 = 36a^4 3...

Math ~CHECK MY ANSWER~ - 1) Which of these is a rational number? a. Pi b. Square...

Math simplifying mixed radicals - Please help me simplify these following mixed...

Math - Just need some help... Directions: Multiply or raise to the power as ...