if x=3 what is the value of the expression -2x(2 x^3+3x^2-5x)
Mathematics · Middle School · Tue Nov 03 2020
Answered on
So we have the equation already: -2x(2 x^3+3x^2-5x) and we also have the value of x=3. What we need to do is just replace x with 3 in our equation.
-2x3(2x3^3 + 3x3^2 - 5x3) =
Lets do the powers inside the bracket first.
-2x3(2x27 + 3x9 - 5x3) =
Lets do the multiplications inside the bracket.
-2x3 (54 + 27 -15) =
-2x3 x 66=
We just do the normal multiplications now.
-6x66=
=-396