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Question 7
Factorise completely:
| (a) | \( 2x^2 + 5x + 3\) | (b) | \( x^2 - 9\) | (c) | \( 3x^2 + 22x + 7\) |
| (d) | \( 7x^2 - 6x - 1\) | (e) | \( x^2 - 81\) | (f) | \( 4x^2 + 8x +3\) |
| (g) | \( a^2 - b^2\) | (h) | \( 8x^2 - 2x - 3\) | (i) | \( 4x^2 - 16\) |
| (j) | \( 12x^2 - 17x + 6\) | (k) | \( 25x^2 - 4y^2\) | (l) | \( 16x^2y^2 - 25b^2\) |