cho tứ giác ABCD có P, Q,M, N lần lượt là trung điểm của AD, BC. Chứng minh rằng vecto AI cộng vecto AK =3/2 vecto AC

Factor completely. x^8 - 1/81 a) (x^4 + 1/9)(x^2 + 1/3)(x^2 - 1/3) b) (x^4 - 1/9)(x^2 + 1/3)(x^2 - 1/3) c) (x^4 + 1/9)(x^2 - 1/3)2

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared

Does the point (1, sqrt 7) lie on circle shown.