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(2x-7)(4x=10)=0
We move all terms to the left:
(2x-7)(4x-(10))=0
We multiply parentheses ..
(+8x^2-20x-28x+70)=0
We get rid of parentheses
8x^2-20x-28x+70=0
We add all the numbers together, and all the variables
8x^2-48x+70=0
a = 8; b = -48; c = +70;
Δ = b2-4ac
Δ = -482-4·8·70
Δ = 64
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{64}=8$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-48)-8}{2*8}=\frac{40}{16} =2+1/2 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-48)+8}{2*8}=\frac{56}{16} =3+1/2 $
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