Question

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

Answer 1

\[\sqrt{5x+21}=x+3\]

Answer 2

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

Answer 3

dbl chk because this way can produce false results

Answer 4

x = 3 works out right,the -4 is just a by product of the method

Answer 5

yeah it is only asking for one answer

Answer 6

then id go with 3 :)

sqrt(5(3) +21) = 3+3

sqrt(36) = 6

Answer 7

3

Answer 8

3 is the answer coz your solution must satisfy the given equation

Answer 9

well we can write this equetion like that
5x+21 = x ^2 + 6x + 9
x + x ^ 2 = 12
x=3
^^