Factor the polynomial completely That is once you are finish

Factor the polynomial completely. That is, once you are finished factoring, none of the factors you obtain should be factorable. (If the expression is not factorable, enter NF.)

a)x² + 4y²

^b)xy 5x + 2y 10

c)xy + 5x + 4y + 20

d)81x² + y²

Solution

a)x2 + 4y2

Not factorable

b)xy 5x + 2y 10

x(y-5) +2(y-5) = (y-5)(x+2)

c)xy + 5x + 4y + 20

x(y+5) +4(y+5) = (y+5)(x+4)

d)81x2 + y2

Not factorable