Question

if y=(2x+3)^4 then at the point (-1,1)

the value of x where the gradient of the tangent is parallel to the x-axis is:

Answer 1

last of my questions @kropot72

Answer 2

i already solved the equation of the normal and it is:

8y+x-7=0

Answer 3

how could one even graph if y' is the gradient of the tangent parallel to the x-axis