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A
6
C
7
(4x²+3)(3x-2)+6x+5=12x³-8x²+9x-6+6x+5=12x³-8x²+15x-1
8
a)x=0,
x+4=0→x=-4,
x-2=0→x=2
b)
x²(x+3)-4(x+3)=0
(x²-4)(x+3)=0
x²=4→x=2, x=-2
x+3=0→x=-3
10
a²(-1)⁶+3(-1)³+6a-2<2
a²-3+6a-2<2
a²+6a-7<0
Δ=36+28=64
√Δ=8
a₁=-7, a₂=1
a∈(-7,1)