Question

Q1) f(x) = 2x^2 - 5x, g(x) 3x^2 find f(2)

Answer 1

f(2)= -2

g(2)= 12

Explanation:

To solve this we use the substitution method. Since f(2) is your variable, we will plug the x-value of 2 into each equation

f(2)= 2(2)^2-5(2)

f(2)=8-10

f(2)= -2

If the same variable is used for both equations then g(x) would be g(2) as well leaving you with

g(x) = 3x^2

g(2)= 3(2)^2

g(2)=12