Solution
x² + (x + 1)² = 145
⇒2x² + 2x + 1 = 145
⇒2x² + 2x – 144 = 0
⇒x²+ x – 72 = 0
⇒x(x + 9) – 8(x + 9) = 0
⇒x = -9, 8
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