4. Subtract by horizontal method.
a. 1672 - 7xy - 28y2 from 23x2 + 2xy - 21
b. 12ab - 18bc - 10ca from 15ab + 9bc + 13ca
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4. Subtract by horizontal method.
a. 1672 - 7xy - 28y2 from 23x2 + 2xy - 21
b. 12ab - 18bc - 10ca from 15ab + 9bc + 13ca
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Answer:
a. 1672-21-7xy+2xy-28y2-23x2
=1651-5xy-5xy