15√3+4√45-√147 8 класс, Help me

Question

15√3+4√45-√147 8 класс, Help me

Answer 1

1) 4 V 45 = 12 V 5
2) V 147 = 7 V 3
3) 15V3 + 12V5 - 7V3 = 8V3 + 12V5 = 4•( 2V3 + 3V5 )