Question

What is the value of f(-1) when f(x)=2x+2? F(-1)=?

Answer 1

Here is your function:

$f(x)=2x+2$

You're looking for f(-1). To get your answer, you have to replace all the x's with -1.

Here is your new equation:

$f(-1) = 2(-1)+2$

Multiply 2 by -1

$2 \times -1 = -2$

Remember:

MULTIPLYING

• Positive(+) times negative(-) is equal to negative

• Positive(+) times positive(+) is equal to positive

• Negative(-) times negative(-) is equal to positive

• Negative(-) times positive(+) is equal to negative

DIVIDING

• Positive(+) divided by positive(+) is equal to positive

• Positive(+) divided by negative(-) is equal to negative

• Negative(-) divided by positive(+) is equal to negative

• Negative(-) divided by negative(-0 is equal to positive

Since you're multiplying a negative number by a positive number, the answer will be negative.

Here is your new equation:

$f(-1) = -2+2$

Add -2 and 2:

$-2+2 = 0$

That means your answer is 0

        ↓

$f(-1)=0$

If you have any questions, feel free to ask in the comments! :)