Answer:
7(s + 7)² - 34(s + 7) = 5
(7s + 49)² - 34s + 238 = 5
49s + 2401 - 34s + 238 = 5
|__________|
15s + 2401 + 238 = 5
15s + 2639 = 5
÷15 ÷15
s = 175.9333...
So your answer is:
I hope this helps!