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

How do you solve 7√3 + √3? I really need help.

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

7x + x = 8x

7√3 + √3 = 8√3

- Math - Radicals -
**Steve**, Saturday, February 2, 2013 at 5:02pm
imagine 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 5:21pm
Ohhh, Thank You!!!! :D

- Math - Radicals -
**Dorana**, Saturday, February 2, 2013 at 5:23pm
But 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 5:24pm
Sometimes 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 5:33pm
That's what I don't get. How can √8 be equal to 2√2?

- Math - Radicals -
**Ms. Sue**, Saturday, February 2, 2013 at 6:53pm
My 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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