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
Simplify: (4m+5n)2+(5m+4n)2
Question 98(iv)
Simplify (25÷28)×2−7
Question 4(ii) Simplify: (2x+5)2−(2x−5)2