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secondary 4 | A Maths
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Tyty
Date Posted: 5 years ago
Views: 392
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Use the formula (a+b)^2= a^2 + 2ab + b^2
Date Posted:
5 years ago
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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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