Bentuk sederhana (2akar7 +6 akar 5) (3akar7-4akar5)

Bentuk sederhana (2akar7 +6 akar 5) (3akar7-4akar5)

$(2 sqrt{7} + 6 sqrt{5} )(3 sqrt{7} - 4 sqrt{5} ) \ = (2 sqrt{7} )(3 sqrt{7} ) + (2 sqrt{7} )( - 4 sqrt{5} ) + (6 sqrt{5})(3 sqrt{7} ) + (6 sqrt{5} )( - 4 sqrt{5} ) \ = (6 times 7 )+ ( - 8 sqrt{35} ) + 18 sqrt{35} + (24 times 5)$
$= 42 + 10 sqrt{35} + 120 \ = 162 + 10 sqrt{35}$