Factorise the following
1) 4x² + 20x + 25
2) 9y² - 66yz + 1212²
3) (2x + ⅓)² - (x - ½)²
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Answer:
1. 4x^2 + 20x + 25
4x^2+10x+10x+25
2x ( 2x+5 ) + 5 ( 2x+5)
(2x+5) ( 2x+5)
2x+5=0 , 2x+5= 0
2x=5 , 2x= 5
x=5/2 , x= 5/2
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