What is the quadratic formula?
Answer
The quadratic formula is a formula used to solve for x. The formula consist of -B plus/minus the square root of B squared minus 4(a)(c)/ 2(a). From there you are given a trinomial(ax^2+bx-c) from there you can substitute the numbers in order for their respected places.
Lets do an example lets say we have 5x^2+7x+10
a=5
b=7
c=10
using the quadratic formula we substitute these numbers in their respected places.
So it would be -7 +/- the square root of 7^2-4(5)10 over 2(5)
next we multiply and subtract 7 times 7 gives us 49-200=-151/10
So we have -7 plus/minus the square root of -151
Unfortunately we have an error we cannot have a negative square root. Therefore we have to replace the negative with I which stands for imaginary number.
So our answer would be -7 plus or minus the square root of 151i.