Question 2 (iv) Simplify (√5−√2)(√5+√2) .
(√5−√2)(√5+√2)=(√5)2−(√2)2 [∵(a+b)(a−b)=a2−b2] = 5-2 = 3
Question 3 (iv) Simplify:
712.812
Question 4(ii) Simplify: (2x+5)2−(2x−5)2