Question

For y = 3x - 2x^2 + 5x^3, show how to find the value for y when x = 3. show your work.

Answer 1

When x = 3 just substitute in equation and solve

y = 3(3)- 2x^2 + 5x^3

Y= 9-2(3)^2+5(3)^3

Y = 9-18+135

Y= 126