1) Simplify: 2 sqrt 5 + 2 sqrt 5
2) Simplify: -3 sqrt 2 + 2 sqrt 2
3) Simplify: 2 sqrt 7 + 3 sqrt 7 + sqrt 7
4) Solve the equation: sqrt x = 9
2007-08-06 04:41:09 · 3 answers · asked by britz13579 1 in Science & Mathematics ➔ Mathematics
1) 2*sqrt(5) + 2*sqrt(5) = 4*sqrt(5)
2) -3*sqrt(2) + 2*sqrt(2) = -1*sqrt(2)
3) 2*sqrt(7) + 3*sqrt(7) + sqrt(7) = 6*sqrt(7)
4) sqrt(x) = 9
x = 9^2
x = 81
2007-08-10 03:39:52 · answer #1 · answered by Kia 6 · 0⤊ 0⤋
You can combine like terms with square roots just like you would with variables. So for 1) through 3), you would use the following approach:
1) 2*sqrt(5) + 2*sqrt(5) = (2 + 2)*sqrt(5) = 4*sqrt(5)
For 4), you just square both sides of the equation to get x = 81, the answer.
2007-08-06 04:50:18 · answer #2 · answered by DavidK93 7 · 0⤊ 0⤋
Is this a maths assignment? I think you ought to do it yourself 'cos I have no idea. You sure that isn't foreign?
I'll have a guess:
1) 4sqrt10
2) -1sqrt4
3) 6sqrt21
4) no idea
don't 100% trust me on these.
2007-08-06 04:47:00 · answer #3 · answered by Vixen23 2 · 0⤊ 3⤋