Which set of expressions are not equivalent? 4x(x) + 3(2x) and 4x2 + 6x 5(3x) - 4(3x) and 3x 4(3a) - 2(4a) and 4a2 3(3a) + a(3a) and 3a2 + 9a

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