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4x(11-7x)=0
We add all the numbers together, and all the variables
4x(-7x+11)=0
We multiply parentheses
-28x^2+44x=0
a = -28; b = 44; c = 0;
Δ = b2-4ac
Δ = 442-4·(-28)·0
Δ = 1936
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{1936}=44$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(44)-44}{2*-28}=\frac{-88}{-56} =1+4/7 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(44)+44}{2*-28}=\frac{0}{-56} =0 $
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