After substituting, what is the first step when evaluating x + 3 x minus 4.2 when x = 5?

Mathematics

2 answers:

Step2247 [10]3 years ago

7 0

Answer:

Adding and subtracting :D

Step-by-step explanation:

okay so after plugging in your x you should have an equation that looks like this:

5+15-4.2

because (x=5)+(3*5)- 4.2

so then you start adding and subtracting:

(5+15)-4.2

20-4.2

15.8

Hope this helps :D

adoni [48]3 years ago

6 0

Answer:

Step-by-step explanation:

x + 3x - 4.2....when x = 5

so we sub

5 + 3(5) - 4.2

I would then multiply the 3 and the 5

5 + 15 - 4.2

then I would add

20 - 4.2

then subtract

15.8

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joja [24]

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3 years ago

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jek_recluse [69]

Answer:

$\boxed{f(6) = 34}$

Step-by-step explanation:

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$g(2) = 3(2)$

$g(2) = 6$

Now, because we are composing the functions, this value we have solved for now replaces the x-values in the f(x) function. So, f(x) becomes f(6), and we use the same manner as above to simplify.

$f(6) = (6)^2-2$