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Home > PC > Chapter 9 > Lesson 9.3.2 > Problem 9-116

9-116.

Show whether or not is a factor of .

Set up the generic rectangle with the divisor on the left of the box. Input only the first terms of the dividend. Generic rectangle, 2 rows, 4 columns, left edge labeled, x minus 5, interior top left, labeled x cubed.

Since divides into , times, write the on top and multiply with the and fill in the grid with the product. Labels added, top edge left, x squared, interior bottom left, negative 5, x squared.

Add an expression to in order to get the needed . Add it to the right of Label added, interior top, second from left, 9 x squared.

Dividing into gives . Add the at the top. Then multiply and and fill the answer in the grid. Labels added: top edge, second from left, + 9 x, interior bottom, second from left, negative 45 x.

Add an expression to in order to get the needed . Add it to the right of Label added: interior top, second from right, 34 x.

Dividing into gives . Add the at the top. Then multiply and and fill the answer in the grid. Labels added: top edge, second from right, + 34, interior bottom, second from right, negative 170.

Add an expression to in order to get the needed . Add it to the right of . This is the remainder. Add it to the top as a ratio. Labels added: top edge, right, 140 divided by quantity x minus 5. Interior top right, 140.

Since there is a remainder, is not a factor!