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(X+7)(X-9)+(X-7)(X+9)+76=0
We multiply parentheses ..
(+X^2-9X+7X-63)+(X-7)(X+9)+76=0
We get rid of parentheses
X^2-9X+7X+(X-7)(X+9)-63+76=0
We multiply parentheses ..
X^2+(+X^2+9X-7X-63)-9X+7X-63+76=0
We add all the numbers together, and all the variables
X^2+(+X^2+9X-7X-63)-2X+13=0
We get rid of parentheses
X^2+X^2+9X-7X-2X-63+13=0
We add all the numbers together, and all the variables
2X^2-50=0
a = 2; b = 0; c = -50;
Δ = b2-4ac
Δ = 02-4·2·(-50)
Δ = 400
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{400}=20$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-20}{2*2}=\frac{-20}{4} =-5 $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+20}{2*2}=\frac{20}{4} =5 $
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