1308.
а) 9(4-3x)^2-4(2x+1)^2=9(16-24x+9x^2)-4(4x^2+2x+1)=144-216x+81x^2-16x^2-8x-4=65x^2-224x+140
b) 3(3-4a)(4a+3)+2(2a+3)^2= -3(4a-3)(4a+3)+2(4a^2+12a+9)=-3(16a^2-9)+8a^2+24a+18=
-48a^2+27+8a^2+24a+18=-40a^2+24a+45
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1308.
а) 9(4-3x)^2-4(2x+1)^2=9(16-24x+9x^2)-4(4x^2+2x+1)=144-216x+81x^2-16x^2-8x-4=65x^2-224x+140
b) 3(3-4a)(4a+3)+2(2a+3)^2= -3(4a-3)(4a+3)+2(4a^2+12a+9)=-3(16a^2-9)+8a^2+24a+18=
-48a^2+27+8a^2+24a+18=-40a^2+24a+45