Posted by Peter on Monday, October 5, 2009 at 9:01pm.
When you're breaking down the square root in the quadratic formula into several parts say it was the originally the square root of 80 so you break it down to square root of 4 and square root of 20would the results be added or multiplyed? Because I know when you further break this down you get 2, the square root of five and the square root of four. Would you add the two 2's, or multiply them? And is there a +/ sign in front of each coefficient or is it just in front of the ACTUAL square root, not the broken down parts of the square root? Thank you so much for clarifying this!

Algebra  Reiny, Monday, October 5, 2009 at 9:22pm
You 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  Rationalize each expression by building perfect nth root factors for ...
 Algebra  69: 16x^2+8x3. I inserted this into the quadratic formula and got 8...
 Math simplifying mixed radicals  Please help me simplify these following mixed ...
 Math  Just need some help... Directions: Multiply or raise to the power as ...
 Math  What is the square root of 12? 3.464 Well, that's true, but you could ...
 algebra  Which shows the expressions in the order they would appear on a number...
 Math ~CHECK MY ANSWER~  1) Which of these is a rational number? a. Pi b. Square...
 math  1) Which of these is a rational number? a. Pi b. Square root 3 ****** c. ...
 Algebra  I used an online math site, to explain quadratic equations. But the ...
More Related Questions