The base and the altitude of a triangle are (3x – 4y) and (6x + 5y) respectively. Find its area.
Reqd. Area = `1/2` (base) x (altitude)
`=1/2` (3x − 4y) (6x + 5y)
`=1/2 ` (18x2 + 15xy − 24xy − 20y2)
`=1/2` (18x2 − 9xy − 20y2) sq. unit.
Concept: Multiplying a Polynomial by a Polynomial
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