Question

Find the value of x so that the function has the given value. You must show your work for each problem in your notebook to receive full credit.
1. f(x) = 6x+9; f(x) = 21
x = ?

2. g(x) = -1/2x + 3; g(x) = -1
x = ?

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Answer 1

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Some functions in variable x is given to us. And the value of the polynomial in x is also given, we need to find the value of x in each case.

GiveN:

1. f(x) = 6x + 9, f(x) = 21
2. g(x) = -1/2x + 3, g(x) = -1

What to find?

• We need to find the value of x in each case.

Step-wise-Step Explanation:

1) f(x) = 6x + 9, f(x) = 21

⇒ f(x) = 21

⇒ 6x + 9 = 21

⇒ 6x = 12

⇒ x = 2

Value of x in this case is 2.

2) g(x) = -1/2 x + 3, g(x) = -1

⇒ g(x) = -1

⇒ -1/2 x + 3 = -1

⇒ -1/2 x = -4

⇒ 1/2 x = 4

⇒ x = 8

Value of x in this case is 8.

Answer 2

Answer:

1. The value of x is 2

2. The value of x is 8