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z²=6²+2²
z²=36+4
z²=40
z=2√10
e)
b²=(3√3)²+(2√5)²
b²=27+20
b²=47
b=√47
f)
3²+c²=(√13)²
9+c²=13
c²=13-9
c²=4
c=2