Which function in vertex form is equivalent to f(x) = x2 + 8 – 16x?

f(x) = (x – 8)2 – 56
f(x) = (x – 4)2 + 0
f(x) = (x + 8)2 – 72
f(x) = (x + 4)2 – 32

if you need just tell me and i will come to the rescue.

step-by-step explanation:

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places

- (2, -7)

- lines r and s and lines t and u must be parallel