Interactive multiple-choice quiz: Solving Polynomial Equation, The Remainder and Factor - Reveal
Polynomial equations are fundamental in algebra, involving terms with variables raised to non-negative integer powers. Understanding how to find remainders and determine factors is crucial for solving higher-degree equations. The Remainder Theorem states that the remainder of the division of a polynomial \(f(x)\) by a linear factor \((x - c)\) is simply \(f(c)\). Building on this, the Factor Theorem provides that if \(f(c) = 0\), then \((x - c)\) is a factor of the polynomial. Techniques such as synthetic division and factoring special patterns, like the difference of cubes or grouping, are essential tools for students to master when working with complex algebraic expressions.
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اختبار شهادة تدريبي مؤقت للصف والمادة والفصل نفسه.
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 + x2 - 24x + 36?
Explanation
Using the Factor Theorem, we check which value makes f(x) = 0. For x + 6, we check f(-6): (-6)3 + (-6)2 - 24(-6) + 36 = -216 + 36 + 144 + 36 = 0. Since f(-6) = 0, x + 6 is a factor.
What are the three factors for \((x^3 + 7x^2 + 7x - 15) \div (x - 1)\)?
Explanation
First, divide x3 + 7x2 + 7x - 15 by x - 1 using synthetic division to get x2 + 8x + 15. Then factor the quadratic: x2 + 8x + 15 = (x + 5)(x + 3). Thus, the three factors are (x - 1)(x + 5)(x + 3).
The formula for the difference of cubes is a3 - b3 = (a - b)(a2 + ab + b2). Here, a = x and b = 7 (since 73 = 343). Applying the formula gives (x - 7)(x2 + 7x + 49).
Divide using synthetic division: (n2 + 10n + 18) by (n + 5)
Explanation
Using synthetic division with root -5 and coefficients [1, 10, 18]: The first coefficient 1 drops down. -5 × 1 = -5. 10 + (-5) = 5. -5 × 5 = -25. 18 + (-25) = -7. The quotient is n + 5 and the remainder is -7.
First, factor out the GCF, which is 2: 2(x3 + 27). Then, use the sum of cubes formula a3 + b3 = (a + b)(a2 - ab + b2) for x3 + 33, which gives 2(x + 3)(x2 - 3x + 9).
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