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Question
Which of the following are quadratic equation in x?
(x + 2)3 = x3 – 8
Sum
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Solution
(x + 2)3 = x3 – 8
⇒ x3 + 6x2 + 12x + 8 = x3 – 8
⇒ 6x2 + 12x + 16 = 0
This is of the form ax2 + bx + c = 0
Hence, the given equation is a quadratic equation.
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Chapter 4: Quadratic Equations - EXERCISE 4A [Page 182]
