What is the vertex form of y = −2x^2 + 4x + 3?

y = -2 ( x - 1)² + 5

Step-by-step explanation:

formula for the vertex: y = a (x - h)² + k where (h, k) is the vertex

y = −2x^2 + 4x + 3

y = -2 (x² - 2x + 1) + 5

y = -2 ( x - 1)² + 5

h = 1

K = 5

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