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