ExamPlay Light Logo
Mag-sign In

Mathematics for IGCSE & O level - Surds (Section 1 - No. 31)

If x=2+√5, and y=2-√5, what is the value of x*y?
-1
9
4
20

Paliwanag

x*y = (2+√5)(2-√5) = 4-5 = -1

Mga komento (0)

Advertisement