Question

A) x²+1=0; 6)x²-8x+65=0. : ITV

Answer 1

$a)x^2+1=0\\x^2=-1\\x=i$

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$x^2-8x+65=0\\D=64-260=-196\\X_1=\frac{8+i14}{2}=4+i7 \\X_2=\frac{8-i14}{2} =4-i7$