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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) 2
(B) 6
(C) -3
(D) 4

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) 22\newline(B) 66\newline(C) 3-3\newline(D) 44

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) 22\newline(B) 66\newline(C) 3-3\newline(D) 44
  1. Recognize the undefined point: Recognize that the function h(x)h(x) is not defined at x=2x = 2 because it would result in a division by zero. However, we are asked to find the limit as xx approaches 22, which will give us the continuous value of h(x)h(x) at x=2x = 2.
  2. Rationalize the denominator: To find the limit of h(x)h(x) as xx approaches 22, we can use the conjugate of the denominator to rationalize it. Multiply the numerator and the denominator by the conjugate of the denominator, which is (x+7+3)(\sqrt{x+7}+3).
  3. Multiply numerator and denominator: Perform the multiplication from Step 22:\newlineh(x)=(x2)(x+7+3)(x+73)(x+7+3)h(x) = \frac{(x-2)(\sqrt{x+7}+3)}{(\sqrt{x+7}-3)(\sqrt{x+7}+3)}
  4. Simplify the denominator: Simplify the denominator using the difference of squares formula:\newlineDenominator = (x+7)2(3)2=x+79=x2(\sqrt{x+7})^2 - (3)^2 = x + 7 - 9 = x - 2
  5. Simplify the numerator: Simplify the numerator by distributing x2x-2 to x+7+3\sqrt{x+7}+3:Numerator=xx+7+3x2x+76\text{Numerator} = x\sqrt{x+7} + 3x - 2\sqrt{x+7} - 6
  6. Cancel out common terms: Notice that the denominator (x2)(x - 2) cancels out with the (x2)(x - 2) term in the numerator, leaving us with:\newlineh(x)=(x+7+3)h(x) = (\sqrt{x+7} + 3)
  7. Substitute x=2x = 2: Now, substitute x=2x = 2 into the simplified h(x)h(x) to find h(2)h(2):h(2)=2+7+3=9+3=3+3=6h(2) = \sqrt{2+7} + 3 = \sqrt{9} + 3 = 3 + 3 = 6

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