Question

For y = 3x - 2x2 +5x3, show how to find the value for y, when x = 3. Show your work

Answer 1

y= 3(3)–2(3)2+5(3)3
y= 9–2*3*2+5*9
y=9–12+5*9
y=9–12+45
y=42

Answer 2

6

Explanation:

y = 3x - 2x² + 5×3

when x = 3

y = 3(3) - 2(3)² + 15

y = 9 - 18 + 15

y = 15 + 9 - 15

y = 24 - 18

y = 6