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3 years ago

If f (x) =5x+40 what is f (x) when x =-5

Mathematics

2 answers:

spayn [35]3 years ago

5 0

F(x)= 15 because 5 times -5 is -25 and -25+40 is 15

Darya [45]3 years ago

4 0

Answer: 15

Step-by-step explanation:

Given function: $\text{f(x)}=5x+40$

To find $\text{f(x)}$ when x=-5, we need to substitute the value of x in the given function, then we get

$\text{f(-5)}=5(-5)+40$

Simplify:

$\Rightarrow\text{f(-5)}=-25+40=40-25$

$\Rightarrow\text{f(-5)}=15$

Therefore, when x=-5, then the value of f(x)=15.

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2 years ago

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3 years ago

-1/3x+2x=3 3/4 what does the variable represent?

svet-max [94.6K]

Start off by combining like terms on the LHS (the terms with x in them).

So we get $\frac{-1}{3}x+2x= \frac{-1}{3}x+ \frac{6}{3}x= \frac{-5}{3}x$

Replacing this result with what we had before on the LHS, we get $\frac{-5}{3}x=3 \frac{3}{4}= \frac{9}{4}$

⇒Solve for x (divide both sides $\frac{-5}{3}$ )
⇒Don't forget about reciprocity rules when dividing. This is the same as multiplying both sides by $\frac{3}{-5}$

⇒ $x= \frac{9}{4}( \frac{3}{-5})
$
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4 0

3 years ago

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