1. Kurangkan: a. 21xy dari 15xy b. 2p + 3q + 4r dari p + q + r c. -6x²y + 3xy² dari x²y - 2xy² - 5x²y² d. 2x³ - 3y³ - 7z³ dari x³ + y³ - 3z³ + 1 e. 7s - 5t + st

Kurangkan

1. 15xy - 21xy = - 6xy

2. P + q + r - 2p - 3q - 4r = - p - 2q - 3r

3. x²y - 2xy² - 5x²y² + 6x²y - 3xy² = 7x²y - 5xy² + 6x²y

4. x³ + y³ - 3z³ + 1 - 2x³ + 3y³ + 7z³ = - x³ + 4y³ + 4z³

5. -st + 3s - 2t - 7s + 5t - st = - 2st - 5s + 3t

Kalikan

1. (2x³ + 3y)(6x - 4y²) = {12x}^{4} - 12y³ - 8x³y² + 18xy

2. (x - 6)(2x + 5) = 2x² - 7x - 30

3. (25x + 13y)(25x - 13y) = 625x² - 169y²

Maaf kalau salah

1.
A. 21xy - 15xy= 6xy

b. 2p + 3q + 4r - p + q + r=
2p-p+3q+q+4r+r = p+4q+5r

c. -6x²y + 3xy² - x²y - 2xy² - 5x²y²
-6x²y - x²y +3xy²-2xy²- 5x²y²
=5x²y-xy²-5x²y²

d. 2x³ - 3y³ - 7z³ - x³ + y³ - 3z³ + 1
2x³- x³-3y³+y³-7z³-3z³+1
=x³- 2y³- 10z³+1

e. 7s - 5t + st - -st + 3s - 2t
7s-5t+st+st+3s-2t
=7s+3s-5t-2t+st+st
=10s-7t+2st

2
A. (2x³ + 3y)(6x - 4y²)
=12x^4 -8x³y²+18xy-12y³

b. (x - 6) (2x + 5)
2x²+5x-12x+30
=2x²-7x+30
c. (25x + 13y) (25x - 13y)
25x²+650xy+13y²