X3 + 13X2 + 40X
factor out an X
X(X2 + 13X + 40)
factor the quadratic expression, what two factors of 40 add up to 13?
X(X + 8)(X + 5)
works the same if that is a negative in front of X3, just sign changes
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(4x + 5)(4x + 5)
40x+16=2540x=25-1640x=9x= 9/40x=0.225
(4x+5)(4x+5)
8(1+5x) +5 = 13+5x => 8+40x + 5 = 13 +5x => 13+40x = 13+5x => 13-13+40x = 13-13+5x => 40x = 5x => 40x - 5x = 0 => 35x = 0 => 35x/35 = 0/35 => x = 0
5x(7xy + 6x + 8)