Q4 of 157 Page 22

Find out the following squares by using the identities:
(10m – 9n)²

Given (10m – 9n)²

We know that

(a– b)² = a² + b² – 2a×b

⇒ (10m – 9n)² = ((10m)² + (9n)² – 2×10m×9n)

⇒ (10m – 9n)² = 100m² + 81n² – 180mn

Find out the following squares by using the identities:

(5x – 4)²

Find out the following squares by using the identities:

(7x + 3y)²

Find out the following squares by using the identities:

(0.4a – 0.5b)²

Find out the following squares by using the identities:

Questions · 157

1. Algebra

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Find out the following squares by using the identities:(10m – 9n)2