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f (-2) = 2(-2)^2 - (-2) + 1
f (-2) = -4^2 + 2 +1
= 16 + 2 + 1
= 19
Dit : bayangan -2
jawab :
f(a) = 2a² - a + 1
f(-2) = 2(-2^2) - (-2) + 1
= 2(4) + 2 + 1
= 8 + 2 + 1
= 11