a^2+b^2+4a-6b+13=0
a^2+4a+4+b^2-6b+9=0
(a^2+4a+4)+(b^2-6b+9)=0
(a + 2)^2 + (b - 3)^2 = 0
所以
(a + 2)= 0 且 (b - 3)= 0
即 a = -2 ,b = 3
所以,
a^2b = (-2)^2×3 =4×3=12
a^2+b^2+4a-6b+13=0
a^2+4a+4+b^2-6b+9=0
(a^2+4a+4)+(b^2-6b+9)=0
(a + 2)^2 + (b - 3)^2 = 0
所以
(a + 2)= 0 且 (b - 3)= 0
即 a = -2 ,b = 3
所以,
a^2b = (-2)^2×3 =4×3=12