Given the quadratic function y = 2x square - 8x + 8 (1), write out the symmetry axis and vertex coordinates of the quadratic function (2) and judge whether (3,2) is in the direction of the quadratic function On the image

Given the quadratic function y = 2x square - 8x + 8 (1), write out the symmetry axis and vertex coordinates of the quadratic function (2) and judge whether (3,2) is in the direction of the quadratic function On the image

y=2x²-8x+8=2(x-2)²
(1) The axis of symmetry is a straight line x = 2, and the vertex coordinates are (2,0);
(2) Substituting x = 3 into the analytic expression, we get y = 2, so the point (3,2) is on the image of the quadratic function
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It is known that the symmetry axis of quadratic function y = a (x + C) square is x = 2, and the value of a and C can be obtained through (1,3) points

The function y = a (x + C) &#, the axis of symmetry x = - C, also known that the axis of symmetry is x = 2, so - C = 2, C = - 2
The function equation becomes y = a (X-2) &# 178;
X = 1, y = 3
a(1-2)²=3
a=3
a=3 c=-2

The sum of inner angles s and the number of sides n of a polygon satisfy the relation s = (n-2) times 180 degrees,
a. (1180 °) B. (7270 / 2 °) C. (4540 °) d. (6720 °)

What do you want to ask

Is the number of diagonal lines and sides of convex polygon a function?

Number of diagonal lines of n polygon = n (n-3) / 2