Math
posted by Hannah .
Find the following function
y=[(x5)(4x+3)]^5
I arrived at 5(6x2)[(x5)(4x+3)]^4
The answer is 5(8x17)[(x5)(4x+3)]^4
but I am not sure how they got the 8x17

first line derivative:
5((x5)(4x+3))^4 (4(x5) + (4x+3))
= 5((x5)(4x+3))^4 (4x20 + 4x+3)
= 5((x5)(4x+3))^4 (8x  17)