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2x² + 7y - 8 + 3x² - 10y + 9
= 2x² + 3x² + 7y - 10y - 8 + 9
= 5x² + (-3y) +1
= 5x² - 3y + 1
6.
p² + 10p + 16 = (p + 8)(p + 2) = p + 8
p² + 9p + 14 (p + 7)(p + 2) p + 7
7 aku lupa cara
8 rumit -,-
9.
p = 5
q = 7
r = -2
p²q - 2pr³
= 5²7 - 2.5.-2³
= 25 . 7 - 10 . -8
= 175 - (-80)
= 175 + 80
= 255
Maaf kalo salah yaa^^
Kalo kurang jelas tanyain aja^^