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Roots are numbers that make an expression equal to zero. If it's an equation like y = mx + b or y = ax²+bx+c or any other equation involving x and y, the roots are those points where the graph crosses the x-axis.

Example 1: y = 2x - 3. The root of this equation is 1.5

Example 2: y = 2x² - x - 15. The roots of this equation are -2.5 and 3.