a* x^2+ b* x+c = 0$$a\cdot x^{2}+b\cdot x+c$$ = $$0$$
a* x^2 = 0- b* x-c$$a\cdot x^{2}$$ = $$0-b\cdot x-c$$
a* x^2 = - b* x-c$$a\cdot x^{2}$$ = $$-b\cdot x-c$$
a = $$a$$ = $$\frac{-b\cdot x-c}{x^{2}}$$ a = - - $$a$$ = $$-\frac{b}{x}-\frac{c}{x^{2}}$$