Question

Multiply mentally and write only the products for each of the following
1. (x + 4) (x + 2) 2. (a + 1) (a + 8)
3. (0+3) (642)
5. (n-1)(n-6) 6. (3-X) (5 - X) 7. (y-7)(y-2)
9. (x-4) (x+6) 10. (p+10) (0-9) 11. (x+8) ry-5)
13. (x² + 3) (x² – 8) 14. (4-7) (10 + 7) 15. (ab 13 (26-4
17. (4x+7) (5x+6) 18. (7x + 1) (x+3) 19. (22 - 36 (2 - 56
20.(2x - 77) (38 +852)
21 Find by inspection the coefficient of x in the following expansions
12 5-013-
1E (20-3 1-2​

Answer 1

1) x^2+2x+4x+8= x^2+6x+8

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Answer 2

Answer:

1.(x+4) (+2)

= x (x+2) + 4 (x+2)

=x²+2x+4x+8

=x²+6x+8

Hope it helps u all

2.(a+1) (a+2)

=a(a+8) + 1 (a+8)

=a²+ 8a + 1a + 8

=a² + 9a + 8

Hope its help u all