A^2+1/A^2-18 SOLVE WITH STEP
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Step-by-step explanation:
A² + 1/A² - 18
A² + 1/A² - 2 + 2 - 18
(A - 1/A)² - 16
(A - 1/A)² - (4)²
(A - 1/A + 4) (A - 1/A - 4)
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