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Question

Simplify: $x(3x - 8) + 3(x^2-5) + 11$

The correct answer is
$6x^2 - 8x - 4$

Simplify Algebraic Expression Step-by-Step

To simplify the given algebraic expression $x(3x - 8) + 3(x^2-5) + 11$, we need to follow the order of operations and combine like terms.

Distribute Terms

First, apply the distributive property to the terms in parentheses:

  • Distribute $x$ into $(3x - 8)$: $x \cdot (3x - 8) = (x \cdot 3x) - (x \cdot 8) = 3x^2 - 8x$
  • Distribute $3$ into $(x^2 - 5)$: $3 \cdot (x^2 - 5) = (3 \cdot x^2) - (3 \cdot 5) = 3x^2 - 15$

Combine Expanded Terms

Now, substitute these expanded forms back into the original expression:

$ (3x^2 - 8x) + (3x^2 - 15) + 11 $

Remove the parentheses:

$ 3x^2 - 8x + 3x^2 - 15 + 11 $

Combine Like Terms

Next, group the like terms together. Like terms are terms that have the same variable raised to the same power.

  • Combine the $x^2$ terms: $3x^2 + 3x^2$
  • Combine the $x$ terms: $-8x$ (there is only one $x$ term)
  • Combine the constant terms: $-15 + 11$

Perform the combinations:

  • $3x^2 + 3x^2 = 6x^2$
  • The $x$ term remains $-8x$
  • $-15 + 11 = -4$

Final Simplified Expression

Putting it all together, the simplified expression is:

$ 6x^2 - 8x - 4 $

This matches one of the options provided.

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Important Questions from Algebra

  1. Simplify $x(9x - 8) + 7(x^2 - 3) + 18$.
  2. Simplify the following.
    $4\left((\frac{3}{4})x^2 - 26x + 17\right) - 3(x^2 + 4x - 14)$

  3. Simplify the given expression.
    $x(3x - 5) + 5(x^2 – 3) + 16$
  4. Simplify: $3\left((\frac{7}{3})x^2 - 25x + 12\right) - 7(x^2 + 9x - 13)$.

  5. Simplify the following.
    $3\left((\frac{6}{3})x^2 - 21x + 18\right) - 6(x^2 + 5x - 18)$

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