F(x) = 2x^2 – 5x; find f(3)

f(3) = 3

Step-by-step explanation:

f(x) = 2x^2 – 5x

Let x = 3

f(3) = 2(3)^2 - 5(3)

      = 2*9 -15

      = 18-15

      =3

f(3)=3

Step-by-step explanation:

This question asks us to find f(3). We want to find what f(x), or y is, when x is equal to 3.

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

Substitute 3 in for x.

f(3)=2(3)^2-5(3)

Solve according to PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition, Subtraction

Evaluate the exponent first. 3^2 is the same as 3*3, which is equal to 9.

f(3)=2(9)-5(3)

Multiply 2 and 9

f(3)=18-5(3)

Multiply 5 and 3

f(3)=18-15

Subtract 15 from 18

f(3)=3