Relations & Functions
Q. 5

If f(x) = 3x + 4, then f(8) = 28.

Explanation:

f(x) is dependent on the value of x. So x is independent while f(x) is the dependent on x i.e. the value of f(x) depends on the value of x.f(x) = 3x + 4, if we have the x's value we can calculate the f(x)'s value. Here the value of x is given as 8 so f(x) when x equals 8 can be calculated.f(x) = 3x + 4,                                                                                                              f(8) = 3(8) + 4 = 24 + 4 = 28.