solve: sqrt5x+21=x+3 solution is x?

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solve: sqrt5x+21=x+3 solution is x?

Mathematics
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\[\sqrt{5x+21}=x+3\]
we under the sqrt by ^2 both sides: 5x +21 = x^2 +6x +9 ; -5x and -21 to get 0 = x^2 +x -12 ; factor the quad to get: x = -4,3
dbl chk because this way can produce false results

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Other answers:

x = 3 works out right,the -4 is just a by product of the method
yeah it is only asking for one answer
then id go with 3 :) sqrt(5(3) +21) = 3+3 sqrt(36) = 6
3
3 is the answer coz your solution must satisfy the given equation
well we can write this equetion like that 5x+21 = x ^2 + 6x + 9 x + x ^ 2 = 12 x=3 ^^

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