Interactive multiple-choice quiz: The Remainder and Factor Theorem - Reveal
The Remainder Theorem and the Factor Theorem are fundamental concepts in algebra for analyzing polynomials. The Remainder Theorem states that when a polynomial \(f(x)\) is divided by \(x - c\), the remainder is equal to \(f(c)\). Building upon this, the Factor Theorem establishes a crucial link: \(x - c\) is a factor of the polynomial \(f(x)\) if and only if \(f(c) = 0\). These theorems allow for efficient factorization of higher-degree polynomials and identification of their roots without performing complex long division.
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اختر إجابة واحدة لكل سؤال. عند الاختيار ستظهر النتيجة فورًا: الأخضر صحيح، والأحمر خطأ، وسيظهر تفسير الإجابة مباشرة إن كان متوفرًا. وبعد آخر سؤال ستظهر الدرجة النهائية تلقائيًا.
Which binomial is a factor of f(x) = x3 - 6x2 + 3x + 10?
Explanation
By the Factor Theorem, x + 1 is a factor if f(-1) = 0. Calculating f(-1) = (-1)3 - 6(-1)2 + 3(-1) + 10 = -1 - 6 - 3 + 10 = 0. Therefore, x + 1 is a factor.
What is the remainder when a3 - 4 is divided by a + 2?
Explanation
According to the Remainder Theorem, the remainder when a polynomial P(a) is divided by a + 2 is P(-2). Substituting a = -2 into a3 - 4 gives (-2)3 - 4 = -8 - 4 = -12.
We know f(4) = 0 for f(x) = x3 - 6x2 + 5x + 12. Factor f(x) completely using this information.
Explanation
Given f(4) = 0, x - 4 is a factor. Dividing the polynomial by x - 4 gives x2 - 2x - 3, which factors into (x + 1)(x - 3). Thus the complete factorization is (x - 4)(x + 1)(x - 3).
Find all the zeros, given that f(-3) = 0. f(x) = 2x3 + 5x2 - 6x - 9
Explanation
Since -3 is a zero, divide 2x3 + 5x2 - 6x - 9 by x + 3 to get 2x2 - x - 3. Factoring 2x2 - x - 3 gives (2x - 3)(x + 1), which yields zeros at 3/2 and -1. The full set of zeros is -3, -1, 3/2.
Find all the factors of x3 - 3x2 - 4x + 12 given that -2 is a zero.
Explanation
Since -2 is a zero, x + 2 is a factor. Dividing x3 - 3x2 - 4x + 12 by x + 2 results in x2 - 5x + 6, which factors further into (x - 2)(x - 3). The complete set of factors is (x + 2)(x - 2)(x - 3).
Find all the real zeros of the function f(x) = 2x3 - 19x2 + 38x + 24 given that x - 4 is a factor.
Explanation
Given x - 4 is a factor, 4 is a zero. Using synthetic or long division to divide the polynomial by x - 4 yields 2x2 - 11x - 6. Factoring this quadratic gives (2x + 1)(x - 6), providing zeros at -1/2 and 6. The real zeros are 4, -1/2, 6.
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