Factories:

16x5 – 144x3

We have,


16x5 – 144x3


= 3x3(x2 – 9)


By using the formula a2 – b2 = (a + b)(a – b)


We get,


16x5 – 144x3 = 3x3(x2 – 9)


= 16x3{(x)2 – (3)2}


= 16x3(x + 3)(x – 3)


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