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= p² + 3 - p² + 3
= p² - p² + 3 + 3
= 6
b. (4y² - y + 8) + (8y² - y - 4)
= 4y² - y + 8 + 8y² - y - 4
= 4y² + 8y² - y - y + 8 - 4
= 12y² - 2y + 4