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Evaluate the limit: _x 2 (x2 + 3x - 10)/(x - 2)

Mathematics

ScanSolve AI Answer

Answer

7

Step-by-step solution

5 steps
  1. Substitute x=2x=2 into the expression to check for an indeterminate form.

    22+3(2)−102−2=4+6−100=00\frac{2^2 + 3(2) - 10}{2 - 2} = \frac{4 + 6 - 10}{0} = \frac{0}{0}

    Since this is an indeterminate form, we need to simplify the expression.

  2. Factor the quadratic expression in the numerator.

    We need two numbers that multiply to −10-10 and add to 3. These numbers are 5 and −2-2.

    x2+3x−10=(x+5)(x−2)x^2 + 3x - 10 = (x+5)(x-2)
  3. Rewrite the limit expression with the factored numerator.

    lim⁡x→2(x+5)(x−2)x−2\lim_{x \to 2} \frac{(x+5)(x-2)}{x-2}
  4. Cancel out the common factor (x−2)(x-2) from the numerator and denominator.

    This is valid because x→2x \to 2 means xx is approaching 2 but is not equal to 2, so x−2≠0x-2 \neq 0.

    lim⁡x→2(x+5)\lim_{x \to 2} (x+5)
  5. Substitute x=2x=2 into the simplified expression.

    2+5=72+5 = 7

    The final answer is 7.

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