(10- sqrt of 7) (10- sqrt of 7) plus 4 times sqrt of 7 I really need help need it for an assignment

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).

Let u = {q, r, s, t, u, v, w, x, y, z} a = {q, s, u, w, y} b = {q, s, y, z} c = {v, w, x, y, z}. list the elements in the set.a ∩ (b ∪ c)a) {q, s, w, y}b) {q, y, z}c) {q, s, u, w, y, z}d) {q, r, w, y, z}