Angelita's answer to :)'s Secondary 1 Maths Singapore question.
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Expand the (x-y) ^2 which is (x-y) (x-y) =x^2-xy+y^2
X^2-xy+y^2=55
X^2-(13) +y^2=55
X^2+y^2-13=55-13
X^2+y^2=42
The answer is 42.
X^2-xy+y^2=55
X^2-(13) +y^2=55
X^2+y^2-13=55-13
X^2+y^2=42
The answer is 42.
Date Posted:
2 years ago
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