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=12a+21
b. 4a (a+b)
=4a²+4ab
c.(3a+4b)(3a-4b)
=9a²-12ab+12ab-16b²
=9a²-16ab²
d.(3x+6)(4x²-12x+7)
=12x³-36x²+21x+24x²-72x+42
=12x³-36x²+24x²+21x-72x+42
=12x³-12x²-51x+42
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b. 4a(a+b) =
c. (3a+4b)(3a-4b) =
d.