Q4 of 157 Page 22

Find out the following squares by using the identities:
(5x – 4)²

Given (5x – 4)²

We know that

(a– b)² = a² + b² – 2a×b

⇒ (5x – 4)² = ((5x)² + (4)² – 2×5x×4)

⇒ (5x – 4)² = 25x² + 16 – 40x

Find out the following squares by using the identities:

(a – 5)²

Find out the following squares by using the identities:

(3x + 5)²

Find out the following squares by using the identities:

(7x + 3y)²

Find out the following squares by using the identities:

(10m – 9n)²

Questions · 157

1. Algebra

1 1 1 1 1 1 1 2 3 4 5 6 1 2 3 4 5 5 5 5 5 6 6 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 5 5 6 6 7 8 9 10 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 1 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 3 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2

Find out the following squares by using the identities:(5x – 4)2