B. Answer the following.
1. In subtracting 4x2 - 2x + 1 from x2 + 5x - 3, Al got -3x2 + 3x - 2 and Bert got -3x2 + 7x - 4. Who is right? Describe the error that had led to the wrong answer.
2. What must be added to x3 - 2x2 + 5 to get 2x3 + x2 - 3?
1. In subtracting 4x2 - 2x + 1 from x2 + 5x - 3, Al got -3x2 + 3x - 2 and Bert got -3x2 + 7x - 4. Who is right? Describe the error that had led to the wrong answer.
2. What must be added to x3 - 2x2 + 5 to get 2x3 + x2 - 3?
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Answer:
1. Bert got the correct or right answer.
2. x³ + 3x² - 8
Step-by-step explanation:
x² + 5x - 3
(+) (-) (+) (-)
- 4x² - 2x + 1
- 3x² + 7x - 4
Al got the wrong answer because he solved it directly without changing the sign and the operational sign from subtraction (-) to addition (+).
Example 5x - 2x = 3x and - 3 + 1 = - 2.
2. 2x³ + x² - 3
+ (-) (+) (-)
- x³ - 2x² + 5
x³ + 3x² - 8
check:
x³ + 3x² - 8
+ x³ - 2x² + 5
2x³ + x² - 3
Hope it helps.
Correct me if I'm wrong.
in each container?
A. 4, 5,8
B. 4,6,8 t for c. 7,8,10 D. 6, 7, 12
2.
Answer:
All is right, But Bert got it wrong because he added 2× - 1 to 5×, instead of subtracting it..
Correct me if I'm wrong