All flashcards
Flashcard 1: If p(−4)=12, what is the remainder when dividing p(x) by x+4?
Answer: Remainder =12. By the Remainder Theorem, the remainder equals p(−4).
Flashcard 2: Find the value of k so that x−2 is a factor of p(x)=x2+kx−6.
Answer: k=1. Set p(2)=0: 4+2k−6=0, so k=1.
Flashcard 3: Find the value of k so that x+3 is a factor of p(x)=2x2+kx−9.
Answer: k=3. Set p(−3)=0: 18−3k−9=0, so k=3.
Flashcard 4: Find the value of k so that x−1 is a factor of p(x)=x3−4x2+kx+3.
Answer: k=0. Set p(1)=0: 1−4+k+3=0, so k=0.
Flashcard 5: What is the remainder when dividing p(x)=x3+2x2−x−2 by x−1?
Answer: p(1)=0. Calculate p(1)=13+2(1)2−1−2=1+2−1−2=0.
Flashcard 6: What is the remainder when dividing p(x)=x3+2x2−x−2 by x+2?
Answer: p(−2)=0. Calculate p(−2)=(−2)3+2(−2)2−(−2)−2=−8+8+2−2=0.
Flashcard 7: What is the remainder when dividing p(x)=x3−2x2+x−2 by x−2?
Answer: p(2)=0. Calculate p(2)=8−8+2−2=0.
Flashcard 8: What is the remainder when dividing p(x)=x3−2x2+x−2 by x+1?
Answer: p(−1)=−6. Calculate p(−1)=−1−2−1−2=−6.
Flashcard 9: Which statement is true if the remainder on division by x−4 is 0?
Answer: (x−4) is a factor of p(x). A zero remainder means the divisor is a factor.
Flashcard 10: What does the Remainder Theorem state for the remainder when dividing p(x) by x−a?
Answer: Remainder =p(a). This is the core statement of the Remainder Theorem.
Flashcard 11: What is the remainder when dividing p(x) by x−3 in terms of p?
Answer: Remainder =p(3). By the Remainder Theorem, substitute a=3.
Flashcard 12: What is the remainder when dividing p(x) by x+5 in terms of p?
Answer: Remainder =p(−5). Since x+5=x−(−5), we have a=−5.
Flashcard 13: What does the Factor Theorem state using p(a) and the factor (x−a)?
Answer: p(a)=0⟺(x−a) is a factor of p(x). The Factor Theorem combines remainder and factorization.
Flashcard 14: Which condition guarantees that (x−a) is a factor of p(x): p(a)=0 or p(a)=0?
Answer: p(a)=0. When p(a)=0, the remainder is zero, making (x−a) a factor.
Flashcard 15: If (x−a) is a factor of p(x), what must the remainder be when dividing by (x−a)?
Answer: Remainder =0. If (x−a) is a factor, then p(a)=0.
Flashcard 16: Identify the value of a used in the Remainder Theorem when the divisor is x−7.
Answer: a=7. For divisor x−7, the value a=7.
Flashcard 17: Identify the value of a used in the Remainder Theorem when the divisor is x+7.
Answer: a=−7. For divisor x+7=x−(−7), the value a=−7.
Flashcard 18: What is the remainder when dividing p(x)=x3−4x+1 by x−2?
Answer: p(2)=1. Calculate p(2)=23−4(2)+1=8−8+1=1.
Flashcard 19: What is the remainder when dividing p(x)=x2+3x−10 by x−2?
Answer: p(2)=0. Calculate p(2)=22+3(2)−10=4+6−10=0.
Flashcard 20: What is the remainder when dividing p(x)=x2+3x−10 by x+5?
Answer: p(−5)=0. Calculate p(−5)=(−5)2+3(−5)−10=25−15−10=0.
Flashcard 21: What is the remainder when dividing p(x)=2x3−x2+5 by x−1?
Answer: p(1)=6. Calculate p(1)=2(1)3−(1)2+5=2−1+5=6.
Flashcard 22: What is the remainder when dividing p(x)=2x3−x2+5 by x+1?
Answer: p(−1)=2. Calculate p(−1)=2(−1)3−(−1)2+5=−2−1+5=2.
Flashcard 23: What is the remainder when dividing p(x)=x4−16 by x−2?
Answer: p(2)=0. Calculate p(2)=24−16=16−16=0.
Flashcard 24: What is the remainder when dividing p(x)=x4−16 by x+2?
Answer: p(−2)=0. Calculate p(−2)=(−2)4−16=16−16=0.
Flashcard 25: If the remainder on division by x−a is r, what is p(a) equal to?
Answer: p(a)=r. The remainder equals the polynomial evaluated at a.
Flashcard 26: If p(6)=−3, what is the remainder when dividing p(x) by x−6?
Answer: Remainder =−3. By the Remainder Theorem, the remainder equals p(6).
Flashcard 27: If p(0)=5, what is the remainder when dividing p(x) by x?
Answer: Remainder =5. Dividing by x means evaluating at x=0.
Flashcard 28: What is the remainder when dividing p(x)=3x2−12x+9 by x−1?
Answer: p(1)=0. Calculate p(1)=3(1)2−12(1)+9=3−12+9=0.
Flashcard 29: Find the value of k so that x+2 is a factor of p(x)=x3+kx2−4x+8.
Answer: k=0. Set p(−2)=0: −8+4k+8+8=0, so k=0.
Flashcard 30: What is the remainder when dividing p(x)=3x2−12x+9 by x−3?
Answer: p(3)=0. Calculate p(3)=3(3)2−12(3)+9=27−36+9=0.