1. Jika x = 2, y = 5, dan z=-1, hitunglah :a. 12x²y – 77b. 2×2 – 4y + 5z​

X = 2, y = 5, z = 1

a.
12x²y -77
= (12 x 2² x 5) – 77
= (12 x 4 x 5) – 77
= 240 – 77
= 163

b.
2×2 – 4y + 5z​
= (2 x 2²) – (4 x 5) + (5 x 1)
= 8 – 20 + 5
= -7

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