SOLUTION: Expand and simlify (a) -3(x² - xy + 2y²) -3x²+3xy-6y² (b) (x – 1)(x + 4) x²+4x -x -4 ----------- --------- x²+3x-4 (c) -2(x + 3)(2x – 1) -2x-
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-> SOLUTION: Expand and simlify (a) -3(x² - xy + 2y²) -3x²+3xy-6y² (b) (x – 1)(x + 4) x²+4x -x -4 ----------- --------- x²+3x-4 (c) -2(x + 3)(2x – 1) -2x-
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Question 203423
:
Expand and simlify
(a) -3(x² - xy + 2y²)
-3x²+3xy-6y²
(b) (x – 1)(x + 4)
x²+4x
-x -4
---------------------
x²+3x-4
(c) -2(x + 3)(2x – 1)
-2x-6 (2x-1)
-4x²+2x
-12x+6
--------------------
-4x²-10x+6
(d) (2x – y)²
(2x-y)(2x-y)
4x²-2xy
-2xy+y²
------------------
4x²-4xy+y²
(e) (2x + 3)(3x – 2) – (x + 5)²
(2x+3)(3x-2)-(x+5)(x+5)
1.) (2x+3)(3x-2)
6x²-4x
9x-2
---------------
6x²+5x-2
2.) (x+5)(x+5)
x²+5x
5x+25
----------------
x²+10x+25
3.)(6x²+5x+2)-(x²+10+25)
6x²+5x+2
- x²+10x+25
---------------
5x²-5x-20
Answer by
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Expand and simlify
(a) -3(x² - xy + 2y²)
-3x²+3xy-6y²
(b) (x – 1)(x + 4)
x²+4x
-x -4
---------------------
x²+3x-4
(c) -2(x + 3)(2x – 1)
-2x-6 (2x-1)
-4x²+2x
-12x+6
--------------------
-4x²-10x+6
(d) (2x – y)²
(2x-y)(2x-y)
4x²-2xy
-2xy+y²
------------------
4x²-4xy+y²
(e) (2x + 3)(3x – 2) – (x + 5)²
(2x+3)(3x-2)-(x+5)(x+5)
1.) (2x+3)(3x-2)
6x²-4x
9x-2
---------------
6x²+5x-2
2.) (x+5)(x+5)
x²+5x
5x+25
----------------
x²+10x+25
3.)(6x²+5x+2)-(x²+10+25)
6x²+5x+2
- x²+10x+25
---------------
5x²-5x-20
(