Geography, 19.03.2021 21:30, berniceallonce22

the expression 2(x²-4x-21) - (x+77) and (x-7) (x+k) are equivalent. what must be the value of k A.-148 B.-71 c.83 D.160

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the expression 2(x²-4x-21) - (x+77) and (x-7) (x+k) are equivalent. what must be the value of k A.-1...