4. What must be subtracted from 4m2 + 5m - 3 to obtain m2 - 3m?
5. From the sum of 462 + 5bc, -262 - 2bc - 2z2 and 2bc + 4c2, subtract the
sum of 562 - c2 and -352 + 2bc + c2.
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hello friends sorry for the question, I can't understand
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