Question

Exercise 13A

Multiply mentally and write only the products for each of the following.

1. (x + 4) (x + 2)
4 (b-2) (b-5)
3. (C+3)(C+2)
2. (a + 1)(a + 8)
5. (n-1) (n-6)
6. (3 - x)(5 - x)
7. (y-7)(y + 3)
8. (m + 3) (m-2)
9. (x-4) (x + 6)
10. (p + 10) (p - 9)
11. (xy + 6) (xy-5)
12. (5-xy) (3 + xy)
13. (x² + 3) (x² – 8)
14. (4 - x²) (10 + x²)
15. (ab-13) (ab - 4)
16. (2x + 3) (3x + 2)
17. (4x + 7) (5x + 6)
18. (7x + 1) (x + 3)
19. (2a² + 3b²) (2a² -5b²)
20. (2x² - 7y²) (3x² + 8y²)

21. Find by inspection the coefficient of x in the following expansions.

(i) (x + 17) (x + 2)
(ii) (x + 1) (3-X)
(iii) (x - p) (x-q)
(iv) (2 + 3x) (3 - 5x)
(v) (5-X) (X + 8)
(vi) (px - 1) (px - 1)

Multiple Choice Questions (MCQs)
Tick (✓) the correct option.

22. What is the coefficient of x²y in the product (7x² - 5y) (x² + 3y)?
(a) - 16
(b) 16
(c) 26
(d) - 26

23. (6m + 1) (3m-2)-(5 + 2m) (2 - 9m) is equal to
(a) - 36m² + 50m - 8
(b) 36m² - 50m -12
(c) 36m² + 32m - 12
(d) - 50m - 12​

Answer 1

Answer:

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