Question

Apabila x=p²-pq+3q² dan y=y²+2pq-q²
tentukan 3x-2y

Answer 1

3x - 2y = 3(p² - pq + 3q²) - 2(y² + 2pq - q²)
= 3p² - 3pq + 9q² - 2y² - 4pq + 2q²
= 3p² - 7pq + 11q² - 2y²

Answer 2

X=p²-pq+3q²
3x=3(p²-pq+3q²)=3p²-3pq+9q²

y=y²+2pq-q²
2y=2(y²+2pq-q²)=2y²+4pq-2q²

3x-2y= (3p²-3pq+9q²)-(2y²+4pq-2q²)
        = 3p²-3pq-4pq+9q²+2q²-2y²
        = 3p²-7pq+11q²-2y²

semoga membantu :)