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w^2-4w+ ?  what lake the expression a perfect square

Sagot :

(w-2)(w-2)                                                                                                                      -2w*w=-2w^2                                                                                                                     w*-2=-2w                                                                                                                         =-4w                                                                                                                               w^2-4w+4
to complete the squre you take the B value ( Ax^2+Bx+c) divide by two then square it so it would be 4