No 27-28 Tolong tolong tolong

27. f(x) = 2x² - x
f(-3) = 2(-3)² - (-3)
= 2(9) - (-3)
= 18 + 3
= 21 (b)
28. f(x) = x² - 10
f(a) = a² - 10 = 26
a² = 26 + 10
a² = 36
a = √36
a = 6

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