The required expression can be obtained as follows.
= 2x3 – 2x2 + 3x + 5 – (2x3 + 7x2 – 2x + 7)
= 2x3 – 2x2 + 3x + 5 + (-2x3 – 7x2 + 2x – 7)
= 2x3– 2x2 + 3x + 5 – 2x3 – 7x2 + 2x – 7
= (2 – 2)x3 + (-2 – 7)x2 + (3 + 2) x + (5 – 7)
= 0x3 + (-9x2) + 5x – 2 = -9x2 + 5x – 2
∴ 2x3 – 2x2 + 3x + 5 is greater than 2x3 + 7x2 – 2x + 7 by -9x2 + 5x – 2