5 + 12 - 5*√9 + 10 *√100 - 45 *2 simplify the radicals, first
5 + 12 - 5*3 + 10*10 - 45*2 perform the multiplications from left to right
5 + 12 - 15 + 100 - 90 now.....just add and subtract
17 - 15 + 100 - 90 =
2 + 10 =
12
