Q20 of 95 Page 87

Find each of the following products:

(9x2 – x + 15) × (x2 – 3)

By using horizontal method,


We have;


= (9x2 – x + 15) × (x2 – 3)


= x2(9x2 – x +15) – 3(9x2 – x + 15)


= 9x4 – x3 + 15x2 – 27x2 + 3x – 45


= 9x4 - x3 – 12x2 + 3x – 45


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