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Let 
h(x)=(x-2)/(sqrt(x+7)-3) when 
x!=2.

h is continuous for all 
x > -7.
Find 
h(2).
Choose 1 answer:
(A) 6
(B) 2
(c) 4
(D) -3

Let h(x)=x2x+73 h(x)=\frac{x-2}{\sqrt{x+7}-3} when x2 x \neq 2 .\newlineh h is continuous for all x>-7 .\newlineFind h(2) h(2) .\newlineChoose 11 answer:\newline(A) 66\newline(B) 22\newline(C) 44\newline(D) 3-3

Full solution

Q. Let h(x)=x2x+73 h(x)=\frac{x-2}{\sqrt{x+7}-3} when x2 x \neq 2 .\newlineh h is continuous for all x>7 x>-7 .\newlineFind h(2) h(2) .\newlineChoose 11 answer:\newline(A) 66\newline(B) 22\newline(C) 44\newline(D) 3-3
  1. Understand the Problem: Understand the problem.\newlineWe need to find the value of the function h(x)h(x) at x=2x = 2. However, the function is not defined at x=2x = 2 because of the denominator becoming zero. We need to find a way to evaluate the limit of h(x)h(x) as xx approaches 22.
  2. Simplify the Function: Simplify the function.\newlineTo find the limit as xx approaches 22, we can try to simplify the function by rationalizing the denominator. This means we will multiply the numerator and the denominator by the conjugate of the denominator.
  3. Multiply by the Conjugate: Multiply by the conjugate. The conjugate of x+73\sqrt{x+7}-3 is x+7+3\sqrt{x+7}+3. We multiply both the numerator and the denominator by this conjugate to rationalize the denominator.
  4. Perform the Multiplication: Perform the multiplication.\newlineh(x)=x2x+73x+7+3x+7+3h(x) = \frac{x-2}{\sqrt{x+7}-3} \cdot \frac{\sqrt{x+7}+3}{\sqrt{x+7}+3}
  5. Apply the Difference of Squares: Apply the difference of squares. When we multiply the denominators, we get (x+73)(x+7+3)(\sqrt{x+7}-3)(\sqrt{x+7}+3) which simplifies to (x+7)9(x+7) - 9 because (ab)(a+b)=a2b2(a-b)(a+b) = a^2 - b^2.
  6. Simplify the Expression: Simplify the expression.\newlineThe denominator simplifies to x2x - 2. The numerator, when multiplied out, is (x2)(x+7+3)(x-2)(\sqrt{x+7}+3).
  7. Cancel out Common Terms: Cancel out the common terms.\newlineThe term (x2)(x-2) is present in both the numerator and the denominator, so they cancel each other out.
  8. Evaluate the Limit: Evaluate the limit.\newlineNow that the (x2)(x-2) terms are canceled, we are left with the limit of x+7+3\sqrt{x+7}+3 as xx approaches 22. We can now directly substitute x=2x = 2 into this expression.
  9. Substitute x=2x = 2: Substitute x=2x = 2.h(2)=2+7+3=9+3=3+3=6h(2) = \sqrt{2+7} + 3 = \sqrt{9} + 3 = 3 + 3 = 6
  10. Choose the Correct Answer: Choose the correct answer.\newlineThe value of h(2)h(2) is 66, which corresponds to answer choice (A)(A).

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