Ch. 1 A linear equation in a single variable x has form: ax=b If not, its a nonlinear equation in 1 variable. Ex: ax 2 +bx +c=0 less than or equal to 2 solutions sin(x)=0 infinite number of solutions ax 5 +bx 4 +cx 3 +dx 2 +ex+f=0 5 or less solutions, no quadratic formulas for this
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