akar700+akar180+akar80-akar721 Please help me

√700 + √180 + √80 - √721
= √(100.7) + √(36.5) + √(16.5) - √721
= 10√7 + 6√5 + 4√5 - √721
= 10√7 + 10√5 - √721
= 10(√7+√5) - √721