[tex]C. 5. (2z-3)+(7z2-9z3) - (3z4 + 5)-8z-3z2+7z3-z4\\=(2z-3)+(14z-27z)-(12z+5)-8z-6z+21z-z*4\\=2z-3+14z-27z-12z-5+7z-z*4\\=-16z-8-z*4\\=-4(4z+2+z)\\=-4(5z+2)[/tex]
a.
T(x) = 3x2 + 6x5 + 4x3 - 5
= 3×(-1)×2 + 6×(-1)×5 + 4×(-1)×3 - 5
= - 6 - 30 - 12 - 5
= -53
Q(x) = 3x + 7x2 – 5x3
= 3×(-2) + 7×(-2)×2 - 5×(-2)×3
= -3×2-7×2×2+5×2×3
= -2(3+7×2-5×3)
= -2(3+14-15)
= -2×2
= -4
