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Allisa [31]
3 years ago
8

If f(x) = x2 - 2x and g(x) = 6x + 4 for which value of x does (t +g)(x)=0​

Mathematics
1 answer:
Vinil7 [7]3 years ago
7 0

Answer:

-2

Assumption:

Find the value of x such that (f+g)(x)=0.

Step-by-step explanation:

(f+g)(x)=0

f(x)+g(x)=0

(x^2-2x)+(6x+4)=0

Combine like terms:

x^2+4x+4=0

This is not too bad too factor on the left hand side since 2(2)=4 and 2+2=4.

(x+2)(x+2)=0

(x+2)^2=0

So we need to solve:

x+2=0

Subtract 2 on both sides:

x=-2

Let's check:

(f+g)(-2)

f(-2)+g(-2)

((-2)^2-2(-2))+(6(-2)+4)

(4+4)+(-12+4)

(8)+(-8)

0

0 was the desired output of (f+g)(x).

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Answer: <em>"7 is a solution to the original equation. The value –1 is an extraneous solution."</em>

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