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1
a. 9y² + 5xy + 7x² - 3y² -7xy - x² = 9y² - 3y² +5xy - 7xy + 7x² - x² = 6y² - 2xy + 6x²
b. ( 9x² - 12x + 5 )+( x² - 7x + 6 ) = 9x^4 - 63x³ + 54x² -12x³ + 84x² - 72x + 5x² -35x + 30 = 9x^4 - 75x³ +143x² -107x +30
c. sama caranya sama b
2.
a. -14xy - 21xz
b. 18x³ + 6x²y +3xy² - 6x²y - 2xy² -y³ = 18x³ + xy² - y²
c. p^4 + 4pq + 2q^4
d. p^5 - 4pq - 2q^5
e. a² + 2ab - 2ac + b²-2bc + c²