Help me pls. I don't understand it.

C

Step-by-step explanation:

m = 5x - 2

(5x - 2)² + 35x - 14 = -12

(5x - 2)² + 7(5x - 2) = -12

Replace (5x - 2) by m in the equation above

m² + 7m = -12

m² + 7m + 12 = 0

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step-by-step explanation:

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step-by-step explanation: