SOLUTION: question on surds square route 5 (X)times square route 10 ----------- -------- solve the following for x 15x - 9 = 3x + 21 2x _ = 6 5

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Question 56919: question on surds
square route 5 (X)times square route 10
--------------------
solve the following for x
15x - 9 = 3x + 21

2x
_ = 6
5
Answer by tutorcecilia(2152) About Me  (Show Source):
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.
15x - 9 = 3x + 21
15x-3x-9=3x-3x+21
12x-9=21
12x-9+9=21+9
12x=30
x=30/12
x=5/2
.
Check by plugging (x=5/2) back into the original equation]
.
2x/5=6
(5)(2x/5)=(5)(6)
2x=30
2x/2=30/2
x=15
.
Check by plugging (x=15) back into the original equation]