add: i) a²+ab-4b, b²+4b-ab, c²+4a-4b
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The required answer is
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Answer:
a^2+b^2+c^2+4a-4b
Step-by-step explanation:
add: i) a²+ab-4b, b²+4b-ab, c²+4a-4b
(a²+ab-4b)+(b²+4b-ab)+( c²+4a-4b)= a²+ab-4b+b²+4b-ab+c²+4a-4b
=a^2+b^2+c^2+ab-ab-4b+4b+4a-4b
=a^2+b^2+c^2+4a-4b
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