(4√7+2√8)² selesaikanlah soal di atas!!!!!

(4√7+2√8)²
= (4√7+2√8)(4√7+2√8)
= 4.4.√7.√7+4.2.√7.√8+2.4.√8.√7+2.2.√8.√8
= 16.7 + 8√56+8√56+4.8
= 112 + 16√56 + 32
= 144+16.2√14
= 144+32√14