4(x² + 3y) - [9xy - {5(2x³ - 3y²) + xy}]
if X=-1 and y=2
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Step-by-step explanation:
4(-1²+3×2)-9-1×2(-5(2×-1²-3×2²)+(-1+2)
=4-5-1+2(-1²-2²-6²)+(3×2-9-1×2)
=-3²+6+20
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