(2a+3b)(4a²+9b²-6ab) multiplication
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=2a(4a^2 + 9b-6ab) 3b (4b^2 + 9b-6ab)
=8a^3+18ab^2-12a^2b + 12a^b +27b^3-18ab^2
=8a^3+18ab^2-18ab^2-12a^2b+12a^2b+27^3
=8a^3+27b^3
=8a^3+18ab^2-12a^2b + 12a^b +27b^3-18ab^2
=8a^3+18ab^2-18ab^2-12a^2b+12a^2b+27^3
=8a^3+27b^3
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hope it will help you
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