Find each of the following products:
(x3 – 2x2 + 5) × (4x - 1)
By using horizontal method,
We have;
= (x3 – 2x2 + 5) × (4x – 1)
= 4x(x3 – 2x2 + 5) – 1(x3 – 2x2 + 5)
= 4x4 – 8x3 + 20x – 1x3 + 2x2 – 5
By arranging the expression in the form of descending powers of x,
We get;
= 4x4 – 8x3 – x3 + 2x2 + 20x – 5
= 4x4 – 9x3 + 2x2 + 20x – 5