Q2 of 59 Page 263

Evaluate the following by using suitable identities:

204×206

Given: (200 + 4)(200 + 6)

= (200)2 + (4 + 6)200 + (4×6),


where x = 200,a = 4,b = 6 in identity (x + a)(x + b) = x2 + (a + b)x + ab


= 40000 + 2000 + 24


= 42024


More from this chapter

All 59 →
2

Evaluate the following by using suitable identities:

83 × 77

 2

Evaluate the following by using suitable identities:

109×108

 1

Verify the identity (a + b)2 ≡ a2 + 2ab + b2 geometrically by taking

a = 2 units, b = 4 units

 1

Verify the identity (a + b)2 ≡ a2 + 2ab + b2 geometrically by taking

a = 3 units, b = 1 unit