Simplify: . 3 square root of 10 end root plus 7 square root of 15 end root minus 6 square root of 10 end root minus 4 square root of 15. 3 square root of 10 end root minus 3 square root of 15. 3 square root of 15 end root minus 3 square root of 10. 3 square root of 30 end root minus 3 square root of 20. 3 square root of 20 end root minus 3 square root of 30