Question

factor completely. x^2-25k^2+12x+36

Answer 1

that IS supposed to a k, right?
Combine like terms:\[x^2+12x+36-25k^2=(x+6)^2-(5k)^2\]This is a "difference of squares", so we factor this as\[(x+6-5k)(x+6+5k)\]post if you do not understand this last step.