X^2+9x−36=0solve the quadratic equation

Let's first see if we can solve this quadratic equation by factoring.

After listing the factors of -36, are there any that will add to 9? After some guessing and checking, you can realize that 12 and -3 will multiply to -36 and add to 9.

Thus, we can simplify our quadratic equation as follows:

step-by-step explanation:

quartic functions has x = –1 and x = –2 as its only two real zeroes:

f(x) = a(x+2)(x+1)   a: real number