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= x kuadrat -3x+2x-6
=x kuadrat -x-6
b. (2x-3)(x-4)
= 2x kuadrat -8x-3x+12
= 2x kuadrat -11x+12
c. (4k+1)(4k+1)
= 8k kuadrat +4k+4k+1
=8k kuadrat + 8k+1
d. (3m+2n)(3m-2n)
=9m kuadrat - 6mn +6mn-4n kuadrat
= 9m kuadrat -4n kuadrat
e. (3-a)(5+a)
=15+3a-5a-a kuadrat
=15-2a-a kuadrat