(-4/7)x=-28

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Solution for (-4/7)x=-28 equation:



(-4/7)x=-28
We move all terms to the left:
(-4/7)x-(-28)=0
Domain of the equation: 7)x!=0
x!=0/1
x!=0
x∈R
We add all the numbers together, and all the variables
(-4/7)x+28=0
We multiply parentheses
-4x^2+28=0
a = -4; b = 0; c = +28;
Δ = b2-4ac
Δ = 02-4·(-4)·28
Δ = 448
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:
$\sqrt{\Delta}=\sqrt{448}=\sqrt{64*7}=\sqrt{64}*\sqrt{7}=8\sqrt{7}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-8\sqrt{7}}{2*-4}=\frac{0-8\sqrt{7}}{-8} =-\frac{8\sqrt{7}}{-8} =-\frac{\sqrt{7}}{-1} $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+8\sqrt{7}}{2*-4}=\frac{0+8\sqrt{7}}{-8} =\frac{8\sqrt{7}}{-8} =\frac{\sqrt{7}}{-1} $

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