Given the set a = {x | - 5 ≤ x ≤ 3}, B = {y | = a-2x-x & sup2;}, where a ∈ R, if a is contained in B, find the range value of real number a RT

Given the set a = {x | - 5 ≤ x ≤ 3}, B = {y | = a-2x-x & sup2;}, where a ∈ R, if a is contained in B, find the range value of real number a RT

A is contained in B, which means that set a is a subset of set B. your question is short of a letter. In fact, the maximum value of the function y = a-2x-x & sup2; is greater than or equal to 3. Because the opening of the quadratic function is downward, set B represents the range of values of the quadratic function, and set B represents the range of numbers from negative infinity to maximum value

Let a = {x} - 2

When a > = 2
C = {y | y = x ^ 2, X belongs to a} = {y | 0

Let B = {x | (2a-1) x2-2x + 1 = 0}, C = {- 1, - 1 / 2.1 / 3,1}, if BUC, find the value range of real number a
Known set a = {x | 1 = 0}
(1) Find Cr (a ∪ b), (CRA ∩ CRB)
(2) If a ∩ C = a, find the value range of real number a

Known set a = {x | 1 = 0}
(1) Find Cr (a ∪ b), (CRA ∩ CRB)
(2) If a ∩ C = a, find the value range of real number a
I don't know if CR means complement?
(1) Know B = {x | x from the title

In ⊙ o, AB is the chord, ∠ AOB = 90 ° and the distance from point O to AB is 5, then the radius of ⊙ o is 0______ ．

As shown in the figure, in ⊙ o, AB is a chord, ∠ AOB = 90 °, OD ⊥ AB, and OD = 5. ∵ OA = ob, OD ⊥ AB, ∠ AOB = 90 °, ∵ 1 = 12 ∠ AOB = 45 °, ∵ 2 = 3 = 45 °, ∵ 1 = 2, ∵ od = ad = 5, ∵ right angle △ ADO, from Pythagorean theorem, OA = OD2 + ad2 = 52