If f(x) = 2x - 10 ; g (x) = 4x + 20 what is the value of (f + g) (3) ?

xafeguerpf3l

xafeguerpf3l

Answered question

2023-02-25

If f ( x ) = 2 x - 10 ; g ( x ) = 4 x + 20 what is the value of (f + g) (3) ?

Answer & Explanation

Valeria Mcdowell

Valeria Mcdowell

Beginner2023-02-26Added 3 answers

Given solution:
Method 1:
Add f ( x ) + g ( x )
( 2 x - 10 ) + ( 4 x + 20 )
Similar terms together.
= 6 x + 10
Then substitute 3 for x .
= 6 ( 3 ) + 10
= 18 + 10
= 28
Method 2:
Substitute 3 into both functions individually.
f ( 3 ) = 2 ( 3 ) - 10
= 6 - 10
= - 4
g ( 3 ) = 4 ( 3 ) + 20
= 12 + 20
= 32
After that, add the results of your substitutions together.
= - 4 + 32
= 28

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