X*(x-14)=275

Solution for X*(x-14)=275 equation:

X(X-14)=275

We move all terms to the left:

X(X-14)-(275)=0

We multiply parentheses

X^2-14X-275=0

a = 1; b = -14; c = -275;
Δ = b2-4ac
Δ = -142-4·1·(-275)
Δ = 1296
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1296}=36$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-14)-36}{2*1}=\frac{-22}{2}
=-11
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-14)+36}{2*1}=\frac{50}{2}
=25
$