1.what is the standard form of the quadratic equation$$ x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$
option 1 $$ a^2+b^2+c=0 $$
option 2$$ a+b+c=0 $$
option 3$$ax^2 + bx + c = 0 $$
option 4 $$ ax+bx^2+c=0 $$