Chain rule for derivatives...why is my answer wrong?

Question

y=(4-2x-3x²)⁵

y^'= 5(-3x² -2x+4)⁴*(-6x-2)

 

I used a online derivative calculatir to check my answer but it gave something completly different. 

Answer 1

Let   h = 4 - 2x - 3x²

 

Therefore,

 

y = h⁵

 

 

Then by the chain rule,

 

y' = 5h⁴h'

 

y' = 5(4 - 2x - 3x²)⁴(-2 - 6x)

 

y' = (-10 - 30x)(4 - 2x - 3x²)⁴