60
The given expression is:
4a + 2b² - 2(a - 3b)
Substitute a = 2, b = 4 into the expression:
4(2) + 2(4)² - 2(2 - 3(4))
= 8 + 2(16) - 2(2 - 12)
= 8 + 32 - 2(-10)
= 8 + 32 + 20
= 60
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