f(x) means x = -2 if you multiply 1/2 by -2 you get -1
Factor using the AC method...
The answer is:
(x+6) (x+8)
Answer: x=12
Step-by-step explanation:

The sum of the angles of the triangle is 180°:

Divide both parts of the equation by 4:

Answer:
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Step-by-step explanation: