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a - bok
a² + a² = (a+3)²
2a² = a²+ 6a + 9
a²-6a-9=0
Δ=36-36 = 0
a = 6/2 = 3
P = a² = 3² = 9
x²+x²=(x+3)²
(x+3)²-x²=x²
x²+9-x²-x²=0
-x² =-9
x²=9
x=√9
x=3
P= 3² = 9