Question

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3x2 − y3 − y3 − z if x = 3, y = −2, and z = −5

Answer 1

   3x² - y³ - y³ - z
= 3x² - 2y³ - z
= 3(3)² - 2(-2)³ - (-5)
= 3*9 - 2(-8) + 5
= 27 +16 + 5
= 48