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The roots of a quadratic function are where the lies interescts with the x-axis. There can be as little as zero.
If you have a quadratic function with real coefficients then it can have: two distinct real roots, or a real double root (two coincidental roots), or no real roots. In the last case, it has two complex roots which are conjugates of one another.
x = [ -b ± √(b2-4ac) ] / 2a Using this formula you get 2 roots for + and -
A quadratic function is ax2+bx+c You can solve for x by using the quadratic formula, which, as the formula requires the use of square roots, would be tricky to put here.
Quadratics can two, one or no real roots.