SOLUTION: This question has proven very tricky, any help would be greatly appreciated. I can solve for x and y on the main problem, but cannot figure this one out. Help please! Let f(x)

Question 246231: This question has proven very tricky, any help would be greatly appreciated. I can solve for x and y on the main problem, but cannot figure this one out. Help please!
Let f(x) = x2 - 8x + 16. Find x so that f(x) = 22
Found 3 solutions by dabanfield, scott8148, kensson:
Answer by dabanfield(803)   (Show Source): You can put this solution on YOUR website!
Let f(x) = x2 - 8x + 16. Find x so that f(x) = 22
If the first term is x2 and not x^2 then:
2x-8x+16 = 22
Then solve for x.
If f(x) = x^2-8x+16 then we have
x^2-8x+16 = 22
x^2-8x-6 = 0
Then solve this quadratic for x.

Answer by scott8148(6628)   (Show Source): You can put this solution on YOUR website!
22 = x^2 - 8x + 16

0 = x^2 - 8x - 6 ___ not factorable

use quadratic formula to find x
Answer by kensson(21)   (Show Source): You can put this solution on YOUR website!

Subtract 22 from each side

This doesn't factorise. Use the formula:

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