# 1. (5x-4)(5x+4) 2. (a+b-c)(a+b+c) 3. (2x+3y-4z)² 4. (3-5y)² 5. (x²-3)³ 6. (5+x)³ 7. (3x-y+2)³ 8.(2-m+4n)(2-m-4n) 9.(a+2b+c+d)² with solution po

1
by reyd

• Brainly User
2015-09-05T01:22:15+08:00

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1) (5x-4) (5x+4) = 25x² + 20x-20x - 16
= 25x² -16

2)  (a + b -c) (a + b + c)
a² + ab + ac + ab + b² + bc -ac - bc -c²
a² + 2ab +b² - c²

3) (2x+3y-4z)²
Expand
(2x + 3y - 4z) (2x+3y-4z)
Multiply each term  in first trinomial by each term in second trinomial.  This is similar to number 2.

4.  (3-5y)² = Expand  (3-5y) (3-5y)
= 9 -15y - 15y + 25y²
= 9-30y + 25y²
25y² -30y + 9

5)   (x²-3)³ = (x² - 3) (x²-3) (x²-3)
= x^6  - 6x^4-3x^4 + 9x² + 18 x² - 27
x^6 -9x ^4 + 27x² - 27

You can do the rest :-)

thank u very much :*