Use appropriate formulae and compute:1852 – 1152

1852 – 1152= (150 + 35)2-(150-35)2(a + b)2-(a-b)2 = 4ab⇒ 1852 – 1152= 4× 150× 35⇒ 1852 – 1152 = 21000

Q6 of 59 Page 162

Use appropriate formulae and compute:
185² – 115²

185² – 115²= (150 + 35)²-(150-35)²

(a + b)²-(a-b)² = 4ab

⇒ 185² – 115²= 4× 150× 35

⇒ 185² – 115² = 21000

Use appropriate formulae and compute:

107 × 93

Use appropriate formulae and compute:

1008×992

If x + y = 7 and xy = 12, find x² + y.

If x + y = 12 and xy = 32, find x² + y.

Questions · 59

2. Algebraic Expressions

1 2 1 2 3 4 1 2 3 1 2 3 4 5 6 7 8 9 10 10 10 10 10 10 1 1 1 1 1 1 1 1 1 2 3 4 5 5 5 5 6 6 6 6 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20