Question on: JAMB Mathematics - 2008

Factorize completely (4x + 3y)2 - (3x - 2y)2

A
(x + 5y)(7x + y)
B
(x + 5y)(7x - y)
C
(x - 5y)(7x + y)
D
(x - 5y)(7x -y)
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Correct Option: A

(4x + 3y)2 - (3x - 2y)2

= 16x2 + 24xy + 9y - (9x2 - 12xy + 4y2)

= 7x2 + 36xy + 5y

= 7x2 + xy + 35xy + 5y2

= (7x2 + xy) + (35xy + 5y2)

= x(7x + y) + 5y(7x + y)

= (7x + y)(x + 5y)

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