simplify
simplify
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Answer:
12x-[3x^2+5x^2-{7x^2-4+3x+x^3+6x^3}-3x]
=12x-[3x^3+5x^2-7x^2+4-3x-7x^3-3x]
=12x+4x^3+2x^2-4+6x
=4x^3+2x^2+18x-4
Step-by-step explanation:
5a-[a^2-{2a-2a^2+8a^3-3a^3+15a^2+9a}
=5a-[a^2-11a-13a^2-5a^3]
=5a^3+12a^2+6a
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