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(4.5+p)(750-30p)=7000
We move all terms to the left:
(4.5+p)(750-30p)-(7000)=0
We add all the numbers together, and all the variables
(p+4.5)(-30p+750)-7000=0
We multiply parentheses ..
(-30p^2+750p-135p+3375)-7000=0
We get rid of parentheses
-30p^2+750p-135p+3375-7000=0
We add all the numbers together, and all the variables
-30p^2+615p-3625=0
a = -30; b = 615; c = -3625;
Δ = b2-4ac
Δ = 6152-4·(-30)·(-3625)
Δ = -56775
Delta is less than zero, so there is no solution for the equation
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