Verified answer

√242 -2√50+√98=  11√2 - 2 * 5√2 + 7√2 = 8√2

(2√45-6√20):3√5=

(6√5 - 12√5) : 3√5 = -6√5 / 3√5 = - 2

(√2+√5)²-(7-2√10)= 2 + 2√10 + 5 - 7 + 2√10 = 4√10

Verified answer

√242-2√50+√98=11√2-10√2+7√2=8√2

(2√45-6√20):3√5=(6√5-12√5):3√5=(-6√5):3√5=-2

(√2 +√5)²-(7-2√10)=2+2√10+5-7+2√10=4√10