Q.Solve: $x^2 - 4x - 21 = 0$

x=7 or x=-3

x=3 or x=-7

x=21 or x=-1

x=6 or x=-2

The correct solution involves applying the fundamental concept to derive the final value step by step...

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Q.Solve: x2−4x−21=0x^2 - 4x - 21 = 0x2−4x−21=0