Question

Given the function f(x) = 3x - 1, find x when f (x) = 20

Answer 1

Answer: x = 7

Explanation:

f (x) = 20 eq_i

f (x) = 3x - 1 eq_ii

eq_i = eq_ii

20 = 3x - 1

3x = 20 + 1

x = 21 ÷ 3

x = 7 answer

hope that helps...

Answer 2

x = 7

Explanation:

given f(x) = 3x - 1 and f(x) = 20, then equate the right sides to find x

3x - 1 = 20 ( add 1 to both sides )

3x = 21 ( divide both sides by 3 )

x = 7