1.

Find the following products : (3x + 4) (3x - 5)

Answer»

(3x + 4) (3x - 5) = (y + 4) (y - 5), where y = 3x 

 = (y+ 4) {y + (-5)} 

 = y2 + {4 + (-5)} + 4 × (-5) 

 = y2 - y - 20 

 = (3x)2 - 3x - 20 

 = 9x2 - 3x - 20



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