x=2, y=3, Z=4
1) 5x² -- 40x
5(2)²-40(2) = 5*4-40*2 = 20-80 = -60
2) 2xy + 3z²
2(2)(3)+3(4)² = 2*2*3 + 3*16 =12+48 = 60
3) 4xz - 5xy
4(2)(4) - 5(2)(3) = 4*2*4 - 5*2*3 = 32-30 = 2
4) 5z²y + 8x
5(4)²(3)+8(2) = 5*16*3+8*2 = 240+16 = 256
5) 6xyz
6(2)(3)(4) = 6*2*3*4 = 144
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Verified answer
x=2, y=3, Z=4
1) 5x² -- 40x
5(2)²-40(2) = 5*4-40*2 = 20-80 = -60
2) 2xy + 3z²
2(2)(3)+3(4)² = 2*2*3 + 3*16 =12+48 = 60
3) 4xz - 5xy
4(2)(4) - 5(2)(3) = 4*2*4 - 5*2*3 = 32-30 = 2
4) 5z²y + 8x
5(4)²(3)+8(2) = 5*16*3+8*2 = 240+16 = 256
5) 6xyz
6(2)(3)(4) = 6*2*3*4 = 144