evaluate expression 6x - 3x 2 + y3 for x =5 and y=3

6(5)-3(5)^2+3^3=-18

To evaluate the expression 6x - 3x^2 + y^3 for x = 5 and y = 3, you'll substitute the given values into the expression and perform the necessary computations.

Let's start by substituting x = 5 and y = 3 into the expression:

6(5) - 3(5)^2 + (3)^3

Now let's simplify each part of the expression:

6(5) = 30

(5)^2 = 25
3(25) = 75

(3)^3 = 27

Now substitute the simplified values back into the expression:

30 - 75 + 27

Next, perform the arithmetic operations:

30 - 75 = -45
-45 + 27 = -18

Therefore, the value of the expression 6x - 3x^2 + y^3 when x = 5 and y = 3 is -18.