Zeros of a function

What is a zero of a function? The best definition I can give you is that a zero of a function is a variable that makes the function equal to zero when it is plugged in. For example if you needed to find the zero of x +8= 0, the zero of the function would be -8. Because -8 +8 = 0. For equations like this, that involve addition or subtraction, the zero is usually the opposite number(the negative). When the function involves multiplication or division the zero itself is just zero. Zeros of the function are important because it shows us where on the x-axis the function intersects.