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September 21, 2014

Posted by **Dorana** on Saturday, February 2, 2013 at 4:43pm.

- Math - Radicals -
**Reiny**, Saturday, February 2, 2013 at 5:02pm7 apples + an apple = 8 apples

7x + x = 8x

7√3 + √3 = 8√3

- Math - Radicals -
**Steve**, Saturday, February 2, 2013 at 5:02pmimagine there's a "1" in front of √3, making it 1√3

so,just as 7x + 1x = (7+1)x = 8x

7√3 + 1√3 = 8√3

- Math - Radicals -
**Dorana**, Saturday, February 2, 2013 at 5:21pmOhhh, Thank You!!!! :D

- Math - Radicals -
**Dorana**, Saturday, February 2, 2013 at 5:23pmBut what if the numbers aren't the same as 2√8 - 3√2? Do you make them equivalent?

- Math - Radicals -
**Steve**, Saturday, February 2, 2013 at 5:24pmSometimes you can

√8 = 2√2 so

2√8-3√2 = 4√2-3√2 = √2

But if you have something like

2√5 + 4√7 you're out of luck

- Math - Radicals -
**Dorana**, Saturday, February 2, 2013 at 5:33pmThat's what I don't get. How can √8 be equal to 2√2?

- Math - Radicals -
**Ms. Sue**, Saturday, February 2, 2013 at 6:53pmMy calculator tells me they are the same.

- Math - Radicals -
**Steve**, Sunday, February 3, 2013 at 1:40pm√(ab) = √a√b

√8 = √(4*2) = √4√2 = 2√2

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