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natima [27]
2 years ago
10

HELP HELP PLEASE!!!

Mathematics
2 answers:
larisa86 [58]2 years ago
8 0

Answer:

a. f(4) = 29

b. f(-2) = -25

c. x = 8

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

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

<u>Algebra I</u>

Equality Properties

  • Multiplication Property of Equality
  • Division Property of Equality
  • Addition Property of Equality
  • Subtraction Property of Equality

Terms/Coefficients

Functions

  • Function Notation

Step-by-step explanation:

<u><em>Part A + B</em></u>

<u>Step 1: Define</u>

<em>Identify.</em>

f(x) = 9x - 7

<u>Step 2: Find</u>

<em>f(4)</em>

  1. Substitute in <em>x</em> [Function f(x)]:                                                                          f(4) = 9(4) - 7
  2. [Order of Operations] Evaluate:                                                                      f(4) = 29

<em>f(-2)</em>

  1. Substitute in <em>x</em> [Function f(x)]:                                                                          f(-2) = 9(-2) - 7
  2. [Order of Operations] Evaluate:                                                                      f(-2) = -25

<em><u>Part C</u></em>

<u>Step 1: Define</u>

<em>Identify.</em>

9x - 7 = 65

<u>Step 2: Solve for </u><em><u>x</u></em>

  1. [Addition Property of Equality] Add 7 on both sides:                                     9x = 72
  2. [Division Property of Equality] Divide 9 on both sides:                                 x = 8
telo118 [61]2 years ago
4 0

Answer:

f(4)=29

f(-2)=-25

x=8

Step-by-step explanation:

a. to find f(4), you need to substitute x with 4...

f(4)=9(4)-7

f(4)=36-7

f(4)=29

b. This is the same for f(-2)

f(-2)=9(-2)-7

f(-2)=-18-7

f(-2)=-25

c. 9x-7=65

      +7    +7 to cancel the 7 out and to isolate the x

9x=72

      divide both sides by 9

x=8

So basically f(8)=65

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