7 akar 112 + 2 akar 252 - 3 akar 175 adalah a. 9 akar 7 b. 12 akar 7 c. 25 akar 7 d. 44 akar 7 e. 55 akar 7

7√112 + 2√252 - 3√175
= 7√4.28 + 2√9.28 - 3√25.7
= 7.2 √28 + 2.3 √28 - 3.5 √7
= 14√28 + 6 √28 - 15√7
= 20√4.7 - 15√7
= 40√7 - 15√7
= 25√7 (c)

7√112 + 2√252 - 3√175
= 7√16√7 + 2√36√7 - 3√25√7
= 7 . 4√7 + 2 . 6√7 - 3 . 5√7
= 28√7 + 12√7 - 15√7
= 25√7