70 - q - q - 2q = 80???

70-q-q-2q= 80

combine like terms first

so you get 70-4q= 80

subtract 70 on both sides and you get -4q= 10

divide -4 on both sides and you get q= 10/-4 or -2.5

x = 2

Step-by-step explanation:

x + 3 = √(4x + 17)

x² + 6x + 9 = 4x + 17

x² + 2x − 8 = 0

(x + 4) (x − 2) = 0

x = 2 or -4

Check for extraneous solutions.

2 + 3 = √(4(2) + 17)

-4 + 3 ≠ √(4(-4) + 17)

x = -4 is not a solution.  So x = 2.