2×5ki power 3 minus 4×5ki power2minus6×5plus25
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(2×5)^3-(4×5)^2-6×3+25
=(10)^3-(20)^2-43
=1000-400-43
=600-43
=557
=(10)^3-(20)^2-43
=1000-400-43
=600-43
=557
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