Factorize 4x2 - 9y2 20x 25 - JAMB Mathematics 2001 Question
Factorize 4x2 - 9y2 + 20x + 25
A
(2x -3y + 5)(2x - 3y - 5)
B
(2x - 3y)(2x + 3y)
C
(2x - 3y +5)(2x + 3y + 5)
D
(2x + 5)(2x - 9y +5)
correct option: c
Given: 4x2 - 9y2 + 20x + 25
Collect like terms: 4x2 + 20x + 25 - 9y2
(2x + 5)(2x + 5) - 9y2
(2x + 5)2 - (3y)2
(2x - 3y +5)(2x + 3y + 5)
Collect like terms: 4x2 + 20x + 25 - 9y2
(2x + 5)(2x + 5) - 9y2
(2x + 5)2 - (3y)2
(2x - 3y +5)(2x + 3y + 5)
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