I need help when factoring.

Question

I did this problem and this what came up:

Reorder the terms:-45 + -13d2 + 2d4

Factor a trinomial.(-5 + -2d2)(9 + -1d2)g

----How did the website factor it and get that answer?

Thank you

Answer 1

2d^4 -13d^2 -45

= (2d^2 +5)(d^2-9) = (2d^+5)(d-3)(d+3)

if you got (-5-2d^2)(9-1d^2) that is equivalent, just unnecessarily more complicated and not factored completely