Question

If alpha and beeta are the roots of ax^2- bx + c( a unequal to 0), find alpha + beeta

Answer 1

ax²-bx+c
α+β= -b/a= -(-b)/a=b/a

Answer 2

Sum of the roots of the quadratic ax^2 + bx + c = 0 is 

α + β = $\frac{-b}{a}$

Sum of the roots of the quadratic ax^2 - bx + c = 0 is 

α + β = $\frac{-(-b)}{a}$

α + β = $\frac{b}{a}$