Math Problem Statement

If a = -3, b = 4, and c = 10, what is the value of the expression below? (2(b^2 - a^2)/c) + 1/2

Solution

The problem reads:

"If a=3a = -3, b=4b = 4, and c=10c = 10, what is the value of the expression below?"

2(b2a2)c+12\frac{2(b^2 - a^2)}{c} + \frac{1}{2}

Step-by-step solution:

  1. Substitute the values of aa, bb, and cc:

    • a=3a = -3
    • b=4b = 4
    • c=10c = 10

    So, the expression becomes:

    2(42(3)2)10+12\frac{2(4^2 - (-3)^2)}{10} + \frac{1}{2}

  2. Calculate b2b^2 and a2a^2:

    • b2=42=16b^2 = 4^2 = 16
    • a2=(3)2=9a^2 = (-3)^2 = 9

    Now, substitute these values into the expression:

    2(169)10+12\frac{2(16 - 9)}{10} + \frac{1}{2}

  3. Simplify inside the parentheses:

    169=716 - 9 = 7

    Now, the expression becomes:

    2×710+12\frac{2 \times 7}{10} + \frac{1}{2}

  4. Multiply and simplify:

    1410+12\frac{14}{10} + \frac{1}{2}

  5. Convert the fractions to have the same denominator:

    1410+510=14+510=1910\frac{14}{10} + \frac{5}{10} = \frac{14 + 5}{10} = \frac{19}{10}

  6. Simplify the result:

    1910=1.9\frac{19}{10} = 1.9

Thus, the value of the expression is 1.9.


Would you like further details or have any questions?

Here are 5 related questions for further practice:

  1. What is the value of the expression 2(b2a2)c\frac{2(b^2 - a^2)}{c} if a=5a = 5, b=2b = 2, and c=3c = 3?
  2. How does the value of aa being negative affect the expression?
  3. Can you solve a similar expression but with different constants, say a=1a = 1, b=3b = 3, c=8c = 8?
  4. What happens if a=ba = b in this type of expression?
  5. How would you solve the expression if the second term was 13\frac{1}{3} instead of 12\frac{1}{2}?

Tip: Always simplify powers and parentheses first to make calculations easier.

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Math Problem Analysis

Mathematical Concepts

Algebra
Substitution
Quadratic Expressions
Arithmetic Operations

Formulas

Expression formula: 2(b^2 - a^2)/c + 1/2
Power rule: a^2 = a * a

Theorems

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Suitable Grade Level

Grades 7-9