1.

Remark: This formula can be used to solveEXAMPLE 8, Solve: x2-4x + 1 = 0.

Answer»

x²-4x-1

= x²-4x+4-3

= (x-2)²-(√3)²

= (x-2-√3)(x-2+√3)

So,

x = 2 +- √3



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