Chứng minh các đẳng thức sau: a) 2(x² + y²) = (x + y²) + ( x- y)²
b) (a + b)² - (a-b) (a+ b) = 2b ( a+ b )
c) x² + y² = ( x+ y²) - 2xy

Someone answer this asap for the function f(x) and g(x) are both quadratic functions. f(x) = x² + 2x + 5 g(x) = x² + 2x - 1 which statement best describes the graph of g(x) compared to the graph of f(x)? a. the graph of g(x) is the graph of f(x) shifted down 1 units. b. the graph of g(x) is the graph of f(x) shifted down 6 units. c. the graph of g(x) is the graph of f(x) shifted to the right 1 unit. d. the graph of g(x) is the graph of f(x) shifted tothe right 6 units.