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These questions are out of the math in focus prelim book page 139 a) Find the value of b in x^2 - 8x + b^2 is a perfect square. hence solve x^2 - 8x - 1 =0 by completing the square. ans is b=4;x= ±√17 +14 ≑ 8.12,-0,123 I don't get what im being asked to do, also what does ≑ mean...