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a2-b2=45
a=15-b
(15-b)²-b²=45
225-30b+b²-b²=45
-30b+180=0
b=6
a=9
a2-b2=45
a=15-b
(15-b)²-b²=45
225-30b+b²=45
b²-30b+180=0
delta=900-720=180
b1=30-30√2/2=30(1-√2)/2=15(1-√2)
b2=30+30√2/2=15(1+√2)