2√20+√28-3√125+4√63-5√80

2√20 + √28 - 3√125 + 4√63 - 5√80
= 2√4×√5 + √4×√7 - 3√25×√5 + 4√9×√7 - 5√5×√16
= 4√5 + 2√7 - 15√5 + 12√7 - 20√5
= -31√5 + 14√7