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Verified answer
JawabR sb x dilanjutkan R sb y
x= - x'
y = - y'
y = 3x² +2x - 1
(-y) = 3(-x)² + 2(-x) - 1
-y = 3x² - 2x - 1
y = - 3x² + 2x + 1
(x, -y) dicerminkan thp sumbu y : (-x, -y)
Jadi
-x = x' => x = -x'
-y = y' => y = -y'
Bayangan dari : y = 3x² + 2x - 1 adalah
(-y') = 3(-x')² + 2(-x') - 1
-y' = 3x'² - 2x' - 1
y = -3x² + 2x + 1