Multiple factors of 36

Question

Factor completely

X>4-13x>2+36

Answer 1

???????? is zat spozed tu be  x^4 -13x^2 +36=0 ???????

let y=x^2 & yu hav y^2 -13y+36=0

(y-9)(y-4)=0

so, x^2=9 or x^2=4

x=+-3   & +-2

Answer 2

Factor Completely of the trinomial

7n^2 +31n + 12

4n^4+3n^2-27

Factoring completely of  the perfect square Trinomial

12x^2+36x+27

Factoring completely

3xy+15-2y-10