57.5k views
2 votes
Could someone explain this to me step by step
genuinely confused

Could someone explain this to me step by step genuinely confused-example-1
User Ekenman
by
7.4k points

2 Answers

3 votes

Think of x as the input and f(x) as the output. If you plug in -2 in the function, you substitute x as -2 and solve. The same thing goes for x as 0. If f(x) is 4, treat it like you are trying to solve for x. As shown in the diagram, they substituted f(x) as 4 and solved for x and came to the conclusion that x was also 4.

User Pedrodotnet
by
8.0k points
3 votes

Answer:


\boxed{\begin{array}{clc}x&|\:\:F(x)\\-2&|\:\:16\\0&|\:\:4\\4&|\:\:4\end{array}}

Explanation:

Given:


\tt F(x)=x^2-4x+4

Solution:

When x=-2


\tt f(-2)=(-2)^2-4*(-2)+4

=4+8+4

=16

The first one is not 12 as we get 16 while solving the number.


\hrulefill

When x=0


\tt f(0)=(0)^2-4*(0)+4

=0+0+4

=4

The second one is correct as we get 4 while solving.


\hrulefill

When f(x)=4

it means


\tt x^2-4x+4=4

Doing middle term Factorization:


\tt x^2-(2+2)x+4=4\\ \tt x^2-2x-2x+4=4

taking common from each two terms


\tt x(x-2)-2(x-2)=4\\\tt (x-2)(x-2)=4\\\tt (x-2)^2=4

square rooting on both sides


\tt (x-2)=√(4)

x-2=2

x=2+2

x=4

The third one is correct as we get 4 while solving.

User Milag
by
6.8k points

No related questions found