Question

The profit from a business is

Answer 1

First of all we will understand the question!!

The question is saying that you are given a function and you have to find the value of x which will give the maximum profit... Lets solve it by finding the extrema using the vertex

$\rm \: p(x) = - 5 {x}^{2} + 30x + 8$

• Identify the coefficients a and b of the quadratic function

$\rm \: p(x) = { - 5x}^{2} + 30x + 8 \\ \rm \: a = - 5 \: and \: b \: = 30$

• Since a<0, the function has the maximum value at x, calculated by substituting a and b into x=-b/2a

$\rm \: x = \frac{30}{ 2 \times (- 5)}$

• Solve the equation for x

$\rm \: x = 3$

• The maximum of the quadratic function is at x=3