Show that (x-1)(x-2)is a factor of 4x^3+3x^2-4x+k
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x-1=0
x=1
x-2=0
x=2
4(1)^3+3(1)^2-4(1)+k
4+3-4+k=0
-3=K
4(2)^3+3(2)^2-4(2)+k
32+12-8+k
16+k
k=-16
yes x-1 and x-2 is a factor
x=1
x-2=0
x=2
4(1)^3+3(1)^2-4(1)+k
4+3-4+k=0
-3=K
4(2)^3+3(2)^2-4(2)+k
32+12-8+k
16+k
k=-16
yes x-1 and x-2 is a factor
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