Explanation:
(4x + y)² - 2z = 16x² + 8xy + y² - 2z
substituting x = 4, y = -2 and z = 6,
= 16(4)² + 8(4)(-2) + (-2)² - 2(6)
= 16(16) + 8(-8) + 4 - 12
= 256 - 64 - 8
= 184
=
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