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2c(5-c)+12c=10c
We move all terms to the left:
2c(5-c)+12c-(10c)=0
We add all the numbers together, and all the variables
2c(-1c+5)+12c-10c=0
We add all the numbers together, and all the variables
2c+2c(-1c+5)=0
We multiply parentheses
-2c^2+2c+10c=0
We add all the numbers together, and all the variables
-2c^2+12c=0
a = -2; b = 12; c = 0;
Δ = b2-4ac
Δ = 122-4·(-2)·0
Δ = 144
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{144}=12$$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(12)-12}{2*-2}=\frac{-24}{-4} =+6 $$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(12)+12}{2*-2}=\frac{0}{-4} =0 $
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