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(4x*7x)/2=12600
We move all terms to the left:
(4x*7x)/2-(12600)=0
We add all the numbers together, and all the variables
(+4x*7x)/2-12600=0
We multiply all the terms by the denominator
(+4x*7x)-12600*2=0
We add all the numbers together, and all the variables
(+4x*7x)-25200=0
We get rid of parentheses
4x*7x-25200=0
Wy multiply elements
28x^2-25200=0
a = 28; b = 0; c = -25200;
Δ = b2-4ac
Δ = 02-4·28·(-25200)
Δ = 2822400
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{2822400}=1680$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-1680}{2*28}=\frac{-1680}{56} =-30 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+1680}{2*28}=\frac{1680}{56} =30 $
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