Christmas MT's answer to James's Secondary 4 A Maths Singapore question.
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The one in red ink.
Date Posted:
5 years ago
step 3 to 4,
u cannot square 3 terms like that.
x+1/x = √19
square both sides,
=> (x+1/x)² = 19
=> x²+ 2 + 1/x² = 19
=> x² + 1/x² = 17
u cannot square 3 terms like that.
x+1/x = √19
square both sides,
=> (x+1/x)² = 19
=> x²+ 2 + 1/x² = 19
=> x² + 1/x² = 17
Oh yea i totally forgot
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