Q4 of 157 Page 22

Find out the following squares by using the identities:
(7x + 3y)²

Given (7x + 3y)²

We know that

(a+ b)² = a² + b² + 2a×b

⇒ (7x + 3y)² = ((7x)² + (3y)² + 2×7x×3y)

⇒ (7x + 3y)² = 49x² + 9y² + 42xy

Find out the following squares by using the identities:

(3x + 5)²

Find out the following squares by using the identities:

(5x – 4)²

Find out the following squares by using the identities:

(10m – 9n)²

Find out the following squares by using the identities:

(0.4a – 0.5b)²

Questions · 157

1. Algebra

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Find out the following squares by using the identities:(7x + 3y)2