x2 + 3x + 1 = (x - 2)2
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x² + 3x + 1 = (x - 2)²
=> x² + 3x + 1 = x² - (2 × x × 2) - 4
=> 3x + 1 = - 4x - 4
=> 3x + 4x = -4 -1
=> 7x = -5
.°. x = -5/7
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Answer:
x = 3/7
Step-by-step explanation:
x² + 3x + 1 = (x - 2)²
x² + 3x + 1 = x² + 4 - 2×x×2
x² + 3x + 1 = x² + 4 - 4x
x² + 3x + 1 - x² - 4 + 4x = 0
7x - 3 = 0
7x = 3
x = 3/7
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