a) x^2+(√5)^2=(2√2)^2
x^2+5=8 |-5
x^2= 3 |√
x= √3
b) (2√3)^2+(3√2)^2=y^2
y^2=12+18
y^2=30 |√
y=√30
c) 15^2+8^2=z^2
z^2=225+64
z^2=289 |√
z=17
