Which model represents a factor of 4x^2-9

The top is 4x^2 -9

Step-by-step explanation:

The blue squares are negative and the  orange squares are postive

The top has 4x^2 +9x -9x -9

The bottom has 4x^2 +3x-3x+3x-3x +9

4/6 = 2/3

so it should take 3/3 hours per man. so 9 hours is the answer 3*3 =9

step-by-step explanation:

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