Answer:
x = - 1
Explanation:
given a parabola in standard form
ax² + bx + c ( a ≠ 0 )
then the vertical axis of symmetry is
x = -
x² + 2x - 8 ← is in standard form
with a = 1, b = 2 , then
x = - = - 1
equation of axis of symmetry is x = - 1
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