## What are roots?

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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 = ax^{2}+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 = 2x^{2} - x - 15. The roots
of this equation are -2.5 and 3.

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