Question

If 2x-7-5x^ has maximum value at x=a then a=

Answer 1

Answer:y=−5x  

+2x−7

Differentiating the above equation with respect to x, give us

dx/dy=10x+2

​  

=−10x+2 =0

Or

2−10x=0

Or

x=  1/5

Hence the above expression reaches its maximum value at x= 1/5  

​  

Answer 2

Answer:

1/5

Step-by-step explanation:

y= -5x^2+2x-7

dy/dx= -10+2

for maximum, dy/dx

2-10x=0

-10x= -2

x= -2/-10

x=1/5