Jawaban:

1) a) Terdiri dari tiga suku

2x², 13x dan -7

b) Koefisien x² = 2

c) Konstanta= -7

2) a) 3a ( a + 2b + c)

= 3a² + 6ab + 3ac

b) 5p(-2p + 3) = -10p² + 15p

c) 2x( 2x + 3y - z ) = 4x² + 6xy - 2xz

3) a) 5x - 2y + 4x - 5y

= 5x + 4x -2y -5y

= 9x - 7y

b) x² - 6x - 5x - 3x²

= x² - 3x² - 6x - 5x

= -2x² - 11x

c) -4m - 3n + 6 -6m + 3n

= -4m -6m -3n + 3n + 6

= -10m + 6

= -5m + 3

d) -2( 3x - y) + 4( x + 3y)

= -6x + 2y + 4x + 12y

= -6x + 4x + 2y + 12y

= -2x + 14y

= -x + 7y

4) a) 7a + 3b

b) 20% . ( x)

c) 10 - ( 3 . ( x) )

d) L = ½ x a x b

5) a) 3a + 6ab - 7a - 3ab

= 3a - 7a + 6ab - 3ab

= -4ab - 5ab

b) -7(3m - 4n -p) - 3(3p -6m - n)

= -21m + 28n + 7p -9p + 18m - 3n

= -21m + 18m + 28n -3n + 7p - 9p

= -3m + 25n - 2p

c) 2( 3x² - x + 1) - 4(x² + 6x - 1)

= 6x² -2x + 2 - 4x² - 24x + 4

= 6x² - 4x² - 2x - 24x + 2 + 4

= 2x² - 26x + 6

= x² - 13x + 3

d) 8(9a - 3b - 4c) -5(4b - 5c)

= 72a - 24b - 32c - 20b + 25c

= 72a - 24b - 20b -32c + 25c

= 72a - 44b - 7c

6) a) ( x + 3) ( x + 1)

= x² + x + 3x + 3

= x² + 4x + 3

b) ( 2y -6)(5y -9)

= 10y² - 18y - 30y + 54

= 10y² - 48y + 54

=5y² - 24y + 27

c) ( 2x - 4)( x + 8)

= 2x² + 8x - 4x - 32

= 2x² + 4x - 32

= x² + 2x - 16

d) ( ax + 5) ( 2x - 7)

= 2ax² + 7ax + 10x - 35

7) ( x + 3)² = ( x + 3)( x + 3)

= x² + 3x + 3x + 9

= x² + 6x + 9

( 4x - 3)² = ( 4x - 3) ( 4x - 3)

= 16x² - 12x - 12x + 9

= 16x² - 24x + 9

x( x + 3)² = ( x² + 3x)²

= ( x² + 3x)( x² + 3x)

= x⁴ + 3x³ + 3x³ + 9x²

= x⁴ + 6x³ + 9x²

(4 - x)² = (4 - x)(4 - x)

= 16 - 4x - 4x + x²

= 16 - 8x + x²

( x + ½)² = ( x + ½)( x + ½)

= x² + ½x + ½ x + ¼

= x² + x + ¼ ( samakan penyebutnya)

= 4x² + 4x + 1

( x - 1/2x)² = ( x - 1/2x)( x - 1/2x)

= x² + 2*x*1/2x + (1/2x)²

= x² + x² + 1/4 x²

= 2x² + 1/4 x²

= 8/4 x² + 1/4 x²

= 9/4 x²

Semoga membantu dan tidak keliru

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