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= 5a(-a + 7b) - 2b(-a + 7b)
= - 5a² + 35ab + 2ab - 14b²
= - 5a² + 37ab - 14b²
2) (x² + 2)(x² - 2)
= x²(x² - 2) + 2(x² - 2)
= x^4 - 2x² + 2x² - 4
= x^4 - 4