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Let 
g(x)=(x-5)/(sqrt(x-4)-1) when 
x!=5.

g is continuous for all 
x > 4.
Find 
g(5).
Choose 1 answer:
(A) 2
(B) 8
(C) 10
(D) 5

Let g(x)=x5x41 g(x)=\frac{x-5}{\sqrt{x-4}-1} when x5 x \neq 5 .\newlineg g is continuous for all x>4 .\newlineFind g(5) g(5) .\newlineChoose 11 answer:\newline(A) 22\newline(B) 88\newline(C) 1010\newline(D) 55

Full solution

Q. Let g(x)=x5x41 g(x)=\frac{x-5}{\sqrt{x-4}-1} when x5 x \neq 5 .\newlineg g is continuous for all x>4 x>4 .\newlineFind g(5) g(5) .\newlineChoose 11 answer:\newline(A) 22\newline(B) 88\newline(C) 1010\newline(D) 55
  1. Define Limit of g(5)g(5): To find the value of g(5)g(5), we need to evaluate the limit of g(x)g(x) as xx approaches 55, because g(x)g(x) is not defined at x=5x = 5 but is continuous for all x > 4. This suggests that we should use the limit process to find g(5)g(5).
  2. Simplify Expression by Conjugate: We can simplify the expression for g(x)g(x) by multiplying the numerator and denominator by the conjugate of the denominator to eliminate the square root in the denominator. The conjugate of x41\sqrt{x-4}-1 is x4+1\sqrt{x-4}+1.
  3. Multiply Numerator and Denominator: Multiplying the numerator and denominator by the conjugate, we get:\newlineg(x) = (x5)(x4+1)(x41)(x4+1)\frac{(x-5)(\sqrt{x-4}+1)}{(\sqrt{x-4}-1)(\sqrt{x-4}+1)}
  4. Simplify Denominator: Simplifying the denominator using the difference of squares, we get: g(x)=(x5)(x4+1)(x4)1g(x) = \frac{(x-5)(\sqrt{x-4}+1)}{(x-4) - 1}
  5. Further Simplify Denominator: Further simplifying the denominator, we get: g(x)=(x5)(x4+1)x5g(x) = \frac{(x-5)(\sqrt{x-4}+1)}{x-5}
  6. Cancel Out Common Term: We can now cancel out the (x5)(x-5) term in the numerator and denominator, as long as xx is not equal to 55. This is valid because we are interested in the limit as xx approaches 55, not the value at x=5x = 5.
  7. Final Simplified Expression: After canceling out the (x5)(x-5) term, we are left with:\newlineg(x)=x4+1(x) = \sqrt{x-4} + 1
  8. Substitute x=5x = 5: Now we can safely substitute x=5x = 5 into the simplified expression to find g(5)g(5):g(5)=54+1g(5) = \sqrt{5-4} + 1
  9. Calculate Final Value: Calculating the square root and adding 11, we get:\newlineg55 = 1\sqrt{1} + 11 = 11 + 11 = 22

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