13-15 yaa tolong bantu

13) (√5 + √2) (√5 + √2) = √5.√5 + (√5)(√2).2 + √2.√2 = 5 + 2√10 + 2 = 7 + 2√10
14) 9/√3 = 9/√3 * √3/√3
= 9√3/3
= 3√3
15) 10/2-√2 =
10/2-√2 * 2+√2/2+√2(akar sekawan)
= 10(2+√2)/4-2
= 10(2+√2)/2
= 5(2+√2)

smoga membantush_!

#jwbnny ad dipict