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x²+3²=5²
x²+9=25
25-9=x²
x²=16
x=√16
x=4
b)
12²+y²=13²
144+y²=169
169-144=y²
y²=25
y=√25
y=5
c)
x=4
4²+4²=y²
16+16=y²
y²=32
y=√32=√4*8=8√2
y=8√2