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Volgvan
3 years ago
14

If f(x)=2x+1 and g(x)=x2-7find(f+g)(x)

Mathematics
2 answers:
scoundrel [369]3 years ago
8 0

Answer:

\boxed{\sf (f+g)(x) = {x}^{2}  + 2x - 6}

Given:

\sf f(x) =2x + 1 \\ \sf g(x) =  {x}^{2}  - 7

To find:

\sf (f + g)(x) = f(x) + g(x)

Step-by-step explanation:

\sf \implies(f + g)x = f(x) + g(x) \\  \\ \sf \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:    = (2x + 1) + ( {x}^{2} - 7) \\  \\ \sf \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:    = 2x + 1 + {x}^{2} - 7 \\  \\ \sf \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:    = {x}^{2} + 2x - 7 + 1 \\  \\ \sf \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:    =  {x}^{2}  + 2x - 6

docker41 [41]3 years ago
7 0

Answer:

x^2+2x -6

Step-by-step explanation:

f(x)=2x+1

g(x)=x^2-7

(f+g)(x)= 2x+1+x^2-7

Combine like terms

      = x^2+2x -6

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