example problems binomial multiplication
Post on 05-Aug-2015
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Example Problems
Problem 1
(x-3)*(5x-4)
First (F)
(x-3)*(5x-4)x*5x=5x^2
Outside (O)
(x-3)*(5x-4)X*-4=-4x
Inside (I)
(x-3)*(5x-4)-3*5x=-15x
Last (L)
(x-3)*(5x-4)-3*-4=12
Add them together
5x^2+-4x+-15x+125x^2-19x+12
Problem 2
(4+8x)*(-7x+5)
F
(4+8x)*(-7x+5)4*-7x=-28x
O
(4+8x)*(-7x+5)4*5=20
I
(4+8x)*(-7x+5)8x*-7x=-56x^2
L
(4+8x)*(-7x+5)8x*5=40x
Add them together
-28x+20-56x^2+40x-56x^2+12x+20
Problem 3
(3z+22)*(9z-11)
F
(3z+22)*(9z-11)3z*9z=27z^2
O
(3z+22)*(9z-11)3z*-11=-33z
I
(3z+22)*(9z-11)22*9z=198z
L
(3z+22)*(9z-11)22*-11=-242
Add them together
27z^2-33+198z-24227z^2+165z-242
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