College Algebra & Trigonometry, 2018a

94 CHAPTER 2. POLYNOMIAL AND RATIONAL FUNCTIONS
(−1.491) 3 − 3 ∗ (−1.491) 2 − 2 ∗ (−1.491) + 7 = −3.3146 − 3 ∗ 2.223+2.982+7
= −3.3146 − 6.669+2.982+7
= −0.0016
The result is not exactly 0 since our answers have been rounded off to the 1000th
place. If we wanted greater accuracy, then we should include greater accuracy in
the value of our answers.
(1.657) 3 − 3 ∗ (1.657) 2 − 2 ∗ (1.657) + 7 = 4.5495 − 3 ∗ 2.7456 − 3.314+7
=4.5495 − 8.2368 − 3.314+7
= −0.0013
and
(2.834) 3 − 3 ∗ (2.834) 2 − 2 ∗ (2.834) + 7 = 22.7614 − 3 ∗ 8.03155 − 5.668+7
=22.7614 − 24.09465 − 5.668+7
= −0.00125