7.Find a quadratic polynomial whose zeros are 5 and -5

8.If p and q are the zeroes of x2+7x+12 then find the value of 1/p + 1/q -2pq

9.If one zero of the polynomial 5z2+13z-p is the reciprocal of the other, then find p

step-by-step explanation:

options

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

i'm not really sure how to answer that

step-by-step explanation: