Use any method to multiply (3a + 2b - c)(a - b + 2c).
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Answer:
3a2_2b2-2c2+ab+5ac-5bc
(3a+2b-c)(a-b+2c)
(6a2-4b2-c2)(-ab+4c2)
-6ab3+24ac4+4ab2-16bc2+abc2-4c3