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Let 
g(x)=8x-5. Which of the following is equivalent to 
g(g(x)) ?
Choose 1 answer:
(A) 
64 x-10
(B) 
64 x-45
(c) 
64x^(2)+25
(D) 
64x^(2)-80 x+25

Let g(x)=8x5 g(x)=8 x-5 . Which of the following is equivalent to g(g(x)) g(g(x)) ?\newlineChoose 11 answer:\newline(A) 64x10 64 x-10 \newline(B) 64x45 64 x-45 \newline(C) 64x2+25 64 x^{2}+25 \newline(D) 64x280x+25 64 x^{2}-80 x+25

Full solution

Q. Let g(x)=8x5 g(x)=8 x-5 . Which of the following is equivalent to g(g(x)) g(g(x)) ?\newlineChoose 11 answer:\newline(A) 64x10 64 x-10 \newline(B) 64x45 64 x-45 \newline(C) 64x2+25 64 x^{2}+25 \newline(D) 64x280x+25 64 x^{2}-80 x+25
  1. Understanding composition of functions: Understand the composition of functions.\newlineTo find g(g(x))g(g(x)), we need to substitute the function g(x)g(x) into itself. This means we will replace every xx in g(x)g(x) with the expression 8x58x - 5.
  2. Substituting g(x)g(x) into itself: Substitute g(x)g(x) into itself.\newlineg(g(x))=g(8x5)g(g(x)) = g(8x - 5)\newlineWe know that g(x)=8x5g(x) = 8x - 5, so we replace xx with (8x5)(8x - 5) in the expression for g(x)g(x).\newlineg(8x5)=8(8x5)5g(8x - 5) = 8(8x - 5) - 5
  3. Simplifying the expression: Simplify the expression.\newlineNow we distribute the 88 inside the parentheses:\newline8(8x5)5=64x4058(8x - 5) - 5 = 64x - 40 - 5\newlineCombine like terms:\newline64x405=64x4564x - 40 - 5 = 64x - 45
  4. Checking the answer choices: Check the answer choices.\newlineWe have simplified g(g(x))g(g(x)) to 64x4564x - 45. Now we compare this with the given answer choices.\newline(A) 64x1064x - 10\newline(B) 64x4564x - 45\newline(C) 64x2+2564x^2 + 25\newline(D) 64x280x+2564x^2 - 80x + 25\newlineThe correct answer is (B) 64x4564x - 45.

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