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Factorisation by Regrouping Terms

If x=1;y=2 ...

Question

If $x = 1; y = 2$ find the values:
$x^{2} + y^{2}$

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Solution

Given that,
$x = 1$ : $y = 2$
$x^{2} + y^{2}$
$= 1^{2} + 2^{2}$
$= 1 + 4$
$= 5$
Then,
We get values of this equation is $5$ .

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