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Question
Solve the following quadratic equation:
3x2 – 243 = 0
Sum
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Solution
Given:
3x2 – 243 = 0
⇒ 3(x2 – 81) = 0
⇒ (x)2 – (9)2 = 0
⇒ (x + 9)(x – 9) = 0
⇒ x + 9 = 0 or x – 9 = 0
⇒ x = –9 or x = 9
Hence, –9 and 9 are the roots of the equation 3x2 – 243 = 0.
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