7x(x+15)=203

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Solution for 7x(x+15)=203 equation:



7x(x+15)=203
We move all terms to the left:
7x(x+15)-(203)=0
We multiply parentheses
7x^2+105x-203=0
a = 7; b = 105; c = -203;
Δ = b2-4ac
Δ = 1052-4·7·(-203)
Δ = 16709
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:
$\sqrt{\Delta}=\sqrt{16709}=\sqrt{49*341}=\sqrt{49}*\sqrt{341}=7\sqrt{341}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(105)-7\sqrt{341}}{2*7}=\frac{-105-7\sqrt{341}}{14} $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(105)+7\sqrt{341}}{2*7}=\frac{-105+7\sqrt{341}}{14} $

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