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a + b = 21
ab = - 7
a) a² + b² = (a + b)² - 2ab
= 441 + 12
= 453
b) 1/a + 1/b = (a + b)/ab
= 21/-7
= - 3
c) a⁴ + b⁴ = (a² + b²)² - 2(ab)²
= 453² - 2(49)
= 205209 - 98
= 205111