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4x(x+3)=7x+9
We move all terms to the left:
4x(x+3)-(7x+9)=0
We multiply parentheses
4x^2+12x-(7x+9)=0
We get rid of parentheses
4x^2+12x-7x-9=0
We add all the numbers together, and all the variables
4x^2+5x-9=0
a = 4; b = 5; c = -9;
Δ = b2-4ac
Δ = 52-4·4·(-9)
Δ = 169
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{169}=13$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-13}{2*4}=\frac{-18}{8} =-2+1/4 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+13}{2*4}=\frac{8}{8} =1 $
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