Q1 of 105 Page 280

Find the errors and correct the following mathematical sentences
(3x)² + 4x + 7 = 3x² + 4x + 7

If LHS is

(3x)² + 4x + 7

Then RHS would be

⇒ (3x)² + 4x + 7

= 3² × x² + 4x + 7

= 9x² + 4x + 7

The error is 9x² instead of 3x²

Hence (3x)² + 4x + 7 = 9x² + 4x + 7

Find the errors and correct the following mathematical sentences

4p + 3p + 2p + p – 9p = 0

Find the errors and correct the following mathematical sentences

3x + 2y = 6xy

Find the errors and correct the following mathematical sentences

(2x)² + 5x = 4x + 5x = 9x

Find the errors and correct the following mathematical sentences

(2a + 3)² = 2a² + 6a + 9

Questions · 105

12. Factorisation

1 1 1 1 1 1 1 2 2 2 2 2 2 2 3 3 3 3 3 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 5 5 5 5 6 7 1 1 1 1 1 2 2 2 2 2 2 2 3 3 3 3 3 3 4 4 4 4 4 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Find the errors and correct the following mathematical sentences(3x)2 + 4x + 7 = 3x2 + 4x + 7