Answer:
b = -4
Step-by-step explanation:
The formula for b is
-b
x = ------- and so -b = 2ax, or b = -2ax
2a
if the axis of symmetry is known, but we need b, substitute the given x and a values to find b:
b = -2(2) = -4
b = -4
The function is then y = 2x^2 - 4x + 10
