f(x) = 4x^2 + 7x – 18 Find f(-9)

Question

f(x) = 4x^2 + 7x – 18
Find f(-9)

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Thu Thảo 3 weeks 2021-09-01T13:39:49+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-09-01T13:41:01+00:00

    Given :

    • f(x) = 4x² + 7x – 18

    To Find :

    • f(- 9) = ?

    Solution :

    As, we have f(x) = 4x² + 7x – 18, so to find f(- 9) substitute value of x as (-9).

     \tt : \implies f(-9) = 4(-9)² + 7(-9) - 18

     \tt : \implies f(-9) = 4 \times 81 + (-63) - 18

     \tt : \implies f(-9) = 324 - 63 - 18

     \tt : \implies f(-9) = 324 - 81

     \tt : \implies f(-9) = 243

     \Large \underline{\boxed{\bf{f(-9) = 243}}}

    Hence, value of f(- 9) = 243.

    0
    2021-09-01T13:41:32+00:00

    Answer:

    f(-9) = 243

    General Formulas and Concepts:

    Pre-Algebra

    Order of Operations: BPEMDAS

    1. Brackets
    2. Parenthesis
    3. Exponents
    4. Multiplication
    5. Division
    6. Addition
    7. Subtraction
    • Left to Right

    Algebra I

    • Function Notations

    Step-by-step explanation:

    Step 1: Define

    f(x) = 4x² + 7x – 18

    f(-9) is x = -9

    Step 2: Evaluate

    1. Substitute in x:                                                                                                f(-9) = 4(-9)² + 7(-9) – 18
    2. Evaluate exponents:                                                                                      f(-9) = 4(81) + 7(-9) – 18
    3. Multiply:                                                                                                           f(-9) = 324 – 63 – 18
    4. Subtract:                                                                                                          f(-9) = 261 – 18
    5. Subtract:                                                                                                          f(-9) = 243

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )