Laura has 400$ invested in shares. On Wednesday the shares show a profit of 12.5%. On Thursday they show a loss of 1/5 on her original investment. What are the shares worth now?

hggtbd I have to do it for me to go to sleep in my life is so much fun to see the was

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204

x = 3 ± √(5+y)