*)=0 as an alternative way of asking for a solution to the trinomial equal to zero. Solve trinomials of type e.g.*x

*²+2*x

*+2 = 4 after having drawn*x

*=*y

*²+2*x

*+2 or*x

*=*y

x

^{2}+2

*+1 or*x

*=*y

*²+*x

*-3 by drawing a linear graph or reading off points. Also solve cubics, reciprocals and exponentials equations with the aid of graphs*x