Question 196046
(1)  x^2 -12x +35
(x-5)(x-7)
.
(2)  2X^2 +11x +5
(2x+1)(x+5)
.
(3) x^4y -16y = x^4 -15y
x^4y -16y +15y -x^4 =0
x^4y -1y -x^4 =0
x^4 (y-1) -y =0,   easy  answer
.
or
x^4y -16y+15y -x^4 =0
x^4y -1y -x^4  =0
y(x^4 -1) -x^4 =0
y(x^2 +1)(x^2-1) -x^4 =0
y(x^2 +1)(x+1)(x-1) -x^4 =0,,,,better  answer
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checking
Let  x=1,  y=2,
original  is  (-1),   answer  is  (-1)  ,,,,ok