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3). -(x+5)-3(x²-2x+1) =
-x-5-3x²+6x-3=
-3x²+5x-8
4). 4xy(x-8y)
5). 5(x²-25) = 5(x-5)(x+5)
= -3 (xkaudrat - 2x + 1) - (x + 5)
= -3xkaudrat + 6x - 3 - x + 5
= -3xkaudrat + 6x - x - 3 + 5
= -3xkaudrat + 5x - 2
5. 5xkaudrat - 125
= ( 5x + 25 ) ( x - 5)
dapat dibuktikan
( 5x + 25 ) ( x - 5 )
= 5x (x - 5) + 25 (x - 5) ==> dijabarkan
= 5xkaudrat - 25x + 25x - 125
= 5xkaudrat - 125
6. 24 + 5x - xkaudrat
= ( 8 - x ) ( 3 + x )
dapat dibuktikan
( 8 - x ) ( 3 + x )
= 8 (3 + x) -x (3 + x) ==> dijabarkan
= 24 + 8x - 3x -xkaudrat
= 24 + 5x - xkaudrat
7. (3x - 4y)kaudrat
= (3x - 4y) (3x - 4y) ==> dijabarkan
= 3x (3x - 4y) - 4y (3x - 4y) ==> dijabarkan lagi
= 9xkaudrat - 12xy - 12xy + 16ykaudrat
= 9xkaudrat - 24xy + 16ykaudrat
8. 2x / y : 4xkaudrat / ykaudrat
= 2xkaudrat / y × ykaudrat / 4xkaudrat
=2xykaudrat / 4xkaudrat y
= 1y / 2x atau y / 2x
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