Answer:
C) 2(4x² + 5x - 4) is your answer
Explanation:
Factor out common factors from all terms.
Note the factors for 8 & 10:
8: 1, 2, 4, 8
10: 1, 2, 5, 10
2 is the largest common factor, and so factor out 2
8x² + 10x - 8 = 2(4x² + 5x - 4)
C) 2(4x² + 5x - 4) is your answer
Note that you cannot factor out anymore common factor numbers or variables.
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