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double brackets, how to expand and simplify these?
Any help would be much obliged, thanks a lot if you do help :)
1. (x+3)(x+1)
2. (x-6)(x+9)
3. (x-5)(x-9)
4. (2x+9)(3x+4)
5. (5x-2)(2x-3)
6. (x+7)squared
7. (2x-3)squared
8. (2x+3)(2x-3)
4 Answers
- 8 years agoFavorite Answer
Times by FOIL
First two numbers
Outer numbers
Inner numbers
Last numbers
Search foil method maths in google :) hope this helps! Try bbc bitesize for better explaining
- 8 years ago
1)x^2+x+3x+3 x^2(squared)+4x+3
2)x^2+9x-6x-54 x^2+3x-54
3)x^2-9x-5x+45 x^2-14x+45
4)6x^2+8x+27x+36 6x^2+35x+36
5)10x^2-15x-4x+6 10x^2-19x+6
6)x^2+7x+7x+49 x^2+14x+49
7)4x^2-6x-6x+9 4x^2-12x+9
8)4x^2-6x+6x-9 4x^2-9
- 8 years ago
First outside inside last
Times everything in first by everything in second.
For the squares, just expand them to a double and simplify normally
- AnthonyLv 78 years ago
Use FOIL:
1. x² + x + 3x + 3 = x² + 4x + 3
2. x² - 9x - 5x + 45 = x² - 14x + 45
3. x² - __ - ___ + ___ = ___________
4. 6x² + 8x + 27x + 36 = __________
5. 10x² - 15x - 4x + 6 = ___________
6. (x + 7)² = x² + 14x + 49
7. = 4x² - 6x - 6x + 9 = ___________
8. 4x² - 9
