Math Problem Statement

Hitunglah nilai bentuk aljabar untuk x = 5. Lalu hitung kembali untuk x = -3.

Solution

The problem in the image asks to calculate the value of four algebraic expressions for two different values of xx:

  1. x=5x = 5
  2. x=3x = -3

The expressions are:

  1. 8x-8x
  2. 4x+74x + 7
  3. 162x16 - 2x
  4. x52\frac{x - 5}{2}

Let's evaluate each of these expressions for both x=5x = 5 and x=3x = -3.

1. 8x-8x

For x=5x = 5: 8(5)=40-8(5) = -40 For x=3x = -3: 8(3)=24-8(-3) = 24

2. 4x+74x + 7

For x=5x = 5: 4(5)+7=20+7=274(5) + 7 = 20 + 7 = 27 For x=3x = -3: 4(3)+7=12+7=54(-3) + 7 = -12 + 7 = -5

3. 162x16 - 2x

For x=5x = 5: 162(5)=1610=616 - 2(5) = 16 - 10 = 6 For x=3x = -3: 162(3)=16+6=2216 - 2(-3) = 16 + 6 = 22

4. x52\frac{x - 5}{2}

For x=5x = 5: 552=02=0\frac{5 - 5}{2} = \frac{0}{2} = 0 For x=3x = -3: 352=82=4\frac{-3 - 5}{2} = \frac{-8}{2} = -4

Summary of Results:

For x=5x = 5:

  1. 8x=40-8x = -40
  2. 4x+7=274x + 7 = 27
  3. 162x=616 - 2x = 6
  4. x52=0\frac{x - 5}{2} = 0

For x=3x = -3:

  1. 8x=24-8x = 24
  2. 4x+7=54x + 7 = -5
  3. 162x=2216 - 2x = 22
  4. x52=4\frac{x - 5}{2} = -4

Would you like more details on any part of the calculations?


Here are 5 related questions to expand your understanding:

  1. How do you simplify algebraic expressions like 4x+74x + 7?
  2. What happens to expressions when substituting positive and negative values of xx?
  3. How would you solve for xx if you were given the result of 4x+74x + 7?
  4. What is the effect of multiplying a variable by a negative constant, like in 8x-8x?
  5. How can you check your solutions to ensure they're correct?

Tip: Always substitute values into an expression carefully, following the correct order of operations (PEMDAS: Parentheses, Exponents, Multiplication and Division, Addition and Subtraction).

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Math Problem Analysis

Mathematical Concepts

Algebra
Substitution

Formulas

Linear equations: ax + b
Substitution of values in expressions

Theorems

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Suitable Grade Level

Grades 6-8