We have,

28 – 31x – 5x^{2}

– 5x^{2} -31x + 28

5x^{2} + 31x – 28

The coefficient of x^{2} is 5

The coefficient of x is 31

Constant term is -28

So, we express the middle term 31x as -4x + 35x

5x^{2} + 31x – 28 = 5x^{2} – 4x + 35x – 28

= x (5x – 4) + 7 (5x – 4)

= (x + 7) (5x – 4)

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