When f is a function and a is a real number, the following are equivilant statements:
-a is a zero of the function y=f(x)
-a is an x-intercept of the graph of f
-a is a solution, or root, of the equation f(x)=0
The only number whose square root is a zero is zero itself.
A fraction is zero only when its numerator is zero and its denominator is nonzero.
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