2015
Mathematics
JAMB
Factorize x2 + 9x + 20
A.
(x − 5)2
B.
(x + 5)(x + 4)
C.
(x – 5)(x + 3)
D.
(x + 3)2
Correct Answer: (x + 5)(x + 4)
Explanation
x2+9x+20 Find the two numbers whose product is 20 and its sum is 9} 5x × 4x = 20x2 5x + 4x = 9x (x2+5x) + (4x+20) x(x+5)+4(x+5)=(x+5)(x+4)
x2+9x+20 Find the two numbers whose product is 20 and its sum is 9} 5x × 4x = 20x2 5x + 4x = 9x (x2+5x) + (4x+20) x(x+5)+4(x+5)=(x+5)(x+4)THIS WEEK's
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