(5x+4)(9x+9)
FOIL
First (5x*9x=45x**2)
Outside (5x*9=45x)
Inside (4*9x=36x)
Last (4*9=36)
45x**2+45x+36x+36
45x**2+81x+36
9(5x**2+9x+4x)
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5x2 + 9x + 4 = (x + 1)(5x + 4).
The factors of x2 + 5x + 4 would be (x + 1) and (x + 4)
9x + 5 = 5x + 179x + 5 - 5x = 179x - 5x = 4x5-4x=1717-5=1212 divided by 4 = 3x=3
(x - 4)(x - 1).
x2-5x+4 = (x-1)(x-4) when factored