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9. If x2 – 4x = 1, find x2 +1x2 |
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Answer» -STEP explanation:Solution, Given, x^2 - 4X = 1 x^2 + 2 × 1 =? We havex^2 - 4x = 1 x ( x - 4) = 1Or, (x + 2) ( x - 2) = 1 Hence the value of x may be 2 or - 2 Now, taking the value of x = 2x^2 + 1 ×2 = 2 ^2 + 1 × 2 = 4 + 2 = 2 Now , taking the value of x = - 2 x^2 + 1 × 2 = (-2)^2 + 1 × 2 = 4 + 2 = 6 |
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