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Question:


marlon0607
Student
High School - 11th Grade

I`m working on adding polynomials.Does anybody know what 3 (3xsquared + 1x - 5)?

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Posted by marlon0607 on Tuesday May 12, 2009 at 4:40 PM and tagged with math.

Answers:

  1. cburr
    cburr Teacher
    Middle School

    eNotes Editor

    Your problem is 3 (3x^2 + 1x - 5).

    In a case like this, what you need to do is multiply each part of the polynomial by 3.

    3 (3x^2) = 9x^2

    3 (1x) = 3x

    3 (-5) = -15

    So, you are left with this:

    9x^2 + 3x - 15

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    Posted by cburr on Tuesday May 12, 2009 at 7:49 PM


  2. gatetochrist Teacher
    High School - 11th Grade

    Seeing as how the question was answered already by the teacher above, I'll provide a calculator answer to the question with some explanations.
    Your question: 3(3x^2 + x - 5)

              = 3* (3x^2 + x -5)

    by distributive property, you multiply 3 to all 3 the coefficients and constant.
                A: 9x^2 + 3x - 15

    On an SAT reasoning test, you might be asked to find the value of x (given that the question provided is in equation form) and knowing how to solve questions such as this one is the first step to solving actual test questions.

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    Posted by gatetochrist on Monday May 18, 2009 at 1:16 AM