Answer
i) You could factor and find the zero for each factor of the quadratic
ii) Use the quadratic formula
iii)Complete the square
Work Step by Step
EX)
$x^2+4x+3=0$
i) $(x+1)(x+3)=0$
ii) $x= \frac{-3 \pm \sqrt{4^2-4*1*3}}{2*1}$
iii) $x^2+4x+4=(x+2)^2=1$
