Wykonaj mnożenie:
a)
b)(a+3)(4-3a)=
3b(b+5)-2b^2=3b^2+15b-2b^2=b^2+15b
(a+3)(4-3a)=4a-3a^2+12-9a=-5a-3a^2+12
a) 3b^2+15b-2b^2=b^2+15b
b)(a+3)(4-3a)=4a-3a^2+12-9a=-3a^2-5a+12
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3b(b+5)-2b^2=3b^2+15b-2b^2=b^2+15b
(a+3)(4-3a)=4a-3a^2+12-9a=-5a-3a^2+12
a) 3b^2+15b-2b^2=b^2+15b
b)(a+3)(4-3a)=4a-3a^2+12-9a=-3a^2-5a+12