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dicerminkan thd garis y = -x
x' = -y ---> y = -x'
y' = -x ---> x = -y'
Persamaan bayangan
y = 2x² + 3x - 10
-x' = 2(-y')² + 3(-y') - 10
-x = 2y² - 3y - 10
x = -2y² + 3y + 10