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36+9=y²
45=y²
y=√45=√9*√3 = 3√3
3²+3√3²=x²
9+27=x²
36=x₂
x=6
b) 2²+x²=4²
4+x²=16
x=√12=2√3
3²+(2√3)²=y²
9+12=y²
21=y²
y=√21