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Comprehension:
Directions: Read the following information and answer the three items that follow:
Let f(x) = x2 + 2x – 5 and g(x) = 5x + 30
What are the roots of the equation g[f(x)] = 0?
  • a)
    1, -1
  • b)
    -1, -1
  • c)
    1, 1
  • d)
    0, 1
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Comprehension:Directions: Read the following information and answer th...
Given: f(x) = x2 + 2x – 5 and g(x) = 5x + 30
⇒ g[f(x)] = g(x2 + 2x – 5) = 5 (x2 + 2x – 5) + 30 = 5x2 + 10x + 5 = 0.
⇒ 5x2 + 10x + 5 = 0
⇒ x2 + 2x + 1 = (x + 1)2 = 0
⇒ x = - 1
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Comprehension:Directions: Read the following information and answer the three items that follow:Let f(x) = x2 + 2x – 5 and g(x) = 5x + 30What are the roots of the equation g[f(x)] = 0?a)1, -1b)-1, -1c)1, 1d)0, 1Correct answer is option 'A'. Can you explain this answer?
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