Q.28. Subtract :
2a(a+b+c)-b(a-b+c) from 4c(-a +b+c)
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Step-by-step explanation:
4c(-a+b+c) - [2a(a+b+c)-b(a-b+c)]
=-4ac+4bc+4c^2 - (2a^2+2ab+2ac-ab+b^2-bc)
=-4ac+4bc+4c^2 - 2a^2-2ab-2ac+ab-b^2+bc
= -2a^2-b^2+4c^2-ab+5bc-6bc
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