MATHS Question. Help PLz =]?

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Solve:
The square root of 7a plus the square root of 28a

Whats the answer?
I think one has to use radicals and junk?

2007-04-12 14:46:39 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

sqrt(7a)+sqrt(28a)
sqrt(7a)+sqrt(4)(sqrt(7a)
sqrt(7a)+2sqrt(7a)
3sqrt(7a)

2007-04-12 14:50:11 · answer #1 · answered by leo 6 · 0⤊ 0⤋

ok sqrt of 28a can be simplified to

sqrt (4*7*a)
which is 2sqrt(7a)
from there you can add the like terms leaving oyu with

3sqrt(7a)

2007-04-12 21:55:18 · answer #2 · answered by c_eckdhal71487 2 · 0⤊ 0⤋

sqrt(7a) + sqrt(28a)
= sqrt(7a) + sqrt(4)*sqrt(7a)
=sqrt(7a) + 2sqrt(7a)
= 3sqrt(7a)

2007-04-12 21:52:17 · answer #3 · answered by ironduke8159 7 · 0⤊ 0⤋