Problem
In a quadratic equation problem, one student made a mistake in copying the coefficient of x and got roots of 3 and -2. Another student made a mistake in copying the constant term and got the roots of 3 and 2. What are the correct roots?
The number of equations should be at least the number of unknowns in order to solve the variables. System of linear equations can be solved by several methods, the most common are the following,
1. Method of substitution
2. Elimination method
3. Cramer's rule
Many of the scientific calculators allowed in board examinations and class room exams are capable of solving system of linear equations of up to three unknowns.
Elements a1 = value of the first term am = value of any term after the first term but before the last term an = value of the last term n = total number of terms m = mth term after the first but before nth d = common difference of arithmetic progression r = common ratio of geometric progression S = sum of the 1stn terms