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aliina [53]
4 years ago
7

Help with question 47 please

Mathematics
1 answer:
geniusboy [140]4 years ago
8 0
\bf (x-y)^2\implies x^2-2xy+y^2\qquad 
\begin{cases}
x^2=25\\
x=\sqrt{25}\\
x=5\\
-----\\
y^2=9\\
y=\sqrt{9}\\
y=3
\end{cases}
\\\\\\
(25)-2(5)(3)+(9)\implies 25-30+9
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