Find the area of a rectangular field whose length is (5x-8y)m and
(9x+4y)m.
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length × breadth
(5x−8y)(9x+4y)
=(5x+−8y)(9x+4y)
=(5x)(9x)+(5x)(4y)+(−8y)(9x)+(−8y)(4y)
=45x2+20xy−72xy−32y2
=45x2−52xy−32y2
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the area of a rectangular field whose length is (5x-8y)m and
(9x+4y)m.
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