What is the factored form of the function f(x)=x³+2x²-15x-36

  (x+3)(x+3)(x-4)

Step-by-step explanation:

I find a graphing calculator immensely helpful for factoring problems. Of course the constant in the binomial factor is the opposite of the x-intercept value. The x-intercept at -3 just touches the axis, so has even multiplicity. It will give rise to a repeated factor.

The x-intercepts of -3, -3 and +4 mean the factorization is ...

  f(x) = (x +3)(x +3)(x -4)

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.