If a = 2 and b= 4, then the value of 3a² – 5ab + 4b² is_________.
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a = 2 and b = 4
3a² - 5ab + 4b²
= 3×(2)² - 5×2×4 + 4×(4)²
= 12 - 40 + 64
= 76 - 40
= 36
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