If PQ and PR are tangent to OE in the given figure, find the value of x. R

7x-10

4x+5

(Simplify your answer.)

PLEASE HELP

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

explanation:

remove parenthesis:

=

apply rule

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multiply fractions:

=

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divide:

=

mordancy.