1) -31 + 2 = -3 + 2 = -12) -4^2 + 7 = -16 + 7 = -93) 25 - 105 + 5^2 = 25 - 50 + 25 = 04) 17^2 - 7^2 = 289 - 49 = 240
1) -31 + 2 = -3 + 2 = -1
2) -4^2 + 7 = -16 + 7 = -9
3) 25 - 105 + 5^2 = 25 - 50 + 25 = 0
4) 17^2 - 7^2 = 289 - 49 = 240