dy/dx =      (making use of d()/dx =  )



a)



 = 15

 = 0



factor:

 = 0



x = 4  and  x = -2  are solutions





Check:  

x=4 ==>     (ok)

x=-2 ==>    (ok)



b)

 = 0

factor:

 = 0



x=-1  and  x=3



be sure to check these (plug each value of x into  ) 

RELATED QUESTIONS

Find the coordinates of the points on the curve y = x^2/(2x-1) where dy/dx = 0.  (answered by josgarithmetic,ikleyn)

Find dy/dx and calculate the gradient of the tangent to the curve y=1/square root 1+x at... (answered by Alan3354)

The curve for which dy/dx = 2*x+k, where k is a constant, is such that the tangent at... (answered by Alan3354)

Given that y = √4x-7  - 2/3(x-4), find dy/dx and show that d^y/dx^2 = -4/(4x-7)√4x-7... (answered by greenestamps)

Given that {{{y=8/x^3}}}, find the value of {{{dy/dx}}} when x = 2. Hence, without using... (answered by Alan3354)

I NEED HELP. PLEASE HELP ME ASAP. THANKS BEFORE :)
1) The straight line with equation... (answered by richard1234)

Given that y = lm(x^2 - 4) for x > 2, find dy/dx. Hence, find, in terms of p , the... (answered by Boreal)

Consider y=√x(3-x)^2.

Show that dy/dx = (3-x)(3-5x)/2√x

Next find the... (answered by greenestamps)

Given that y=(x-3)square root x-1, find dy/dx and the value of x for which the gradient... (answered by Boreal)