Select the correct answer.

Which of these is the standard form of the following function?

[tex]\[ f(x)=7(x-1)^2+3 \][/tex]

A. [tex]\(f(x)=7 x^2-14 x-50\)[/tex]

B. [tex]\(f(z)=-7 x^2-14 x+10\)[/tex]

C. [tex]\(f(x)=-7 x^2-14 x-10\)[/tex]

D. [tex]\(f(z)=7 x^2-14 x+10\)[/tex]



Answer :

To find the standard form of the given function [tex]\( f(x) = 7(x - 1)^2 + 3 \)[/tex], we will convert it from the vertex form to the standard quadratic form [tex]\( ax^2 + bx + c \)[/tex].

1. Expand the squared term:
[tex]\[ (x - 1)^2 = x^2 - 2x + 1 \][/tex]

2. Distribute the 7 across the expanded quadratic:
[tex]\[ 7(x - 1)^2 = 7(x^2 - 2x + 1) \][/tex]
[tex]\[ = 7x^2 - 14x + 7 \][/tex]

3. Add the constant term 3 to complete the equation:
[tex]\[ f(x) = 7x^2 - 14x + 7 + 3 \][/tex]
[tex]\[ f(x) = 7x^2 - 14x + 10 \][/tex]

Thus, the function [tex]\( f(x) = 7(x - 1)^2 + 3 \)[/tex] in standard form is [tex]\( f(x) = 7x^2 - 14x + 10 \)[/tex].

Now, we compare this with the given choices:

A. [tex]\( f(x) = 7x^2 - 14x - 50 \)[/tex]
B. [tex]\( f(x) = -7x^2 - 14x + 10 \)[/tex]
C. [tex]\( f(x) = -7x^2 - 14x - 10 \)[/tex]
D. [tex]\( f(x) = 7x^2 - 14x + 10 \)[/tex]

Matching our result with the choices, the correct answer is:

D. [tex]\( f(x) = 7x^2 - 14x + 10 \)[/tex]