The plus or minus signis used to indicate that the value to its can be either added or subtracted to the value to its left. For example, is a way of writing or using just one expression. To write this symbol with MathQuill, type \pm and then a space.
The quadratic formula is a formula that can be used to find solutions to quadratic equations. If a quadratic equation is written in the form, then the quadratic formula states that its solutions will be:
A root of a polynomial, also called a zero of a polynomial, is a value ofthat makes the polynomial equal to 0. For a polynomial equation, if a root is a real number, then this tells us the -coordinate of one of the graphs’ -intercepts. Solutions to the quadratic formula, for example, tell us the roots of quadratic equations. Let’s say that we have the equation . We can factor this to be . If we set , then the values that solve the quadratic equation are the roots of the polynomial equation, and .