Let u = R, set a = {x | x2 + 3x + 2 = 0}, B = {x | x2 + (M + 1) x + M = 0}; if (a complements in U) intersection B = empty set, find the value of M

Let u = R, set a = {x | x2 + 3x + 2 = 0}, B = {x | x2 + (M + 1) x + M = 0}; if (a complements in U) intersection B = empty set, find the value of M

X & # 178; + 3x + 2 = 0 (x + 1) (x + 2) = 0 x = - 1 or x = - 2A = {- 1, - 2} X & # 178; + (M + 1) x + M = 0 (x + m) (x + 1) = 0 x + M = 0 or x + 1 = 0 x = - m or x = - 1 (CUA) ∩ B = empty set CUA = {x | x ≠ - 1 and X ≠ - 2} so B = {- 1} or B = {- 1, - 2} so - M = - 1 or - M = - 2, M = 1 or M = 2
A={-1，-2}
If (a complements in U) intersects B = an empty set, then B may be an empty set or - 1 and - 2 are his solutions
When the discriminant is 0, M + 1 = 3 and M = 2 hold. So finally, M = 1 and 2
Points c and D are the two golden section points of line ab. if CD = 5, what is ab equal to
5 times root 5 + 10
Given that the power of a + B + 2A + 4B = - 5, then the value of a + B is?
The second power of a + the second power of B + 2A + 4B = - 5
The second power of a + the second power of B + 2A + 4B + 5 = 0
（a²+2a+1）+（b²+4b+4）=0
(a+1)²+(b+2)²=0
a=-1 b=-2
a+b=-1-2=-3
Let u = R, a = {x | x2 + 3x + 2 = 0}, B = {x | x2 + (M + 1) x + M = 0. If the intersection B of a's complement is an empty set, the value of M is obtained
The complement intersection B of a is an empty set, so B is a subset of A
And a = {- 1, - 2}
When B is an empty set, △ = (M + 1) ^ 2-4m = (m-1) ^ 2
If point C.D is the golden section of line AB and ab = 2, then CD =?
AB=2×﹙√5-1﹚／2=√5-1 AC=2-﹙√5-1﹚=3-√5 AC=BD CD=2- 2﹙3-√5 ﹚=2√5-4
Given that the a power of 2 = 3, the B power of 4 = 5, and the C power of 8 = 7, find the 2A power of 8 + c-4b
No talent, thank you
∵2^a=3 4^b=5 8^c=7
∴8^(2a+c-4b)
=8^(2a)·8^c·8^(-4b)
=2^(6a)·8^c·64^(-2b
)=(2^a)^3·8^c·4^(-6b
)=(2^a)^3·8^c·(4^b)^(-6)
=3^3·7·1/5^6
=189/15625
Let u = R, a = {x} | x ^ 2 + 3x + 2 = 0}, B = {x} x ^ 2 | + (M + 1) x + M = 0}, if the intersection B of (A's complement) is not equal to the empty set, find the value of real number M
I first find out the two roots - 2, - 1 of x ^ 2 + 3x + 2 = 0
Then substitute x ^ 2 | + (M + 1) x + M = 0 to get a value, M = 2, but M has another value, M = 1
I don't know how to find - 1. I can't solve it if I bring it in
The solution set of a is {- 2, - 1}
The solution set of B is {- 1, - M}
Intersection B is not equal to an empty set
So - M ≠ - 1 or - M ≠ - 2
M ≠ 1 or m ≠ 2
If point C is a point on line AB and the square of AC equals AB times BC, is point C the golden section point of line AB?
If not, request the value of BC when AB = 2; if not, please explain the reason
Quick answer, the best today (the latest on April 10) thank you
If. AC ^ 2 = AB * BC, then AC / AB = BC / AC = (AB-AC) / AC = AB / ac-1, the solution is AC / AB = (√ 5-1) / 2 = 0.618. When AB = 2, BC = 3 - √ 5
Of course! In line with the definition of equal proportion, that is, the golden ratio. The difference between the root sign five and one, and then divided by two, is about 0.618. The next time you ask a question, you have to score.
The value of BC is 0.764
3 (3a + 2) to the power of 2002 = - 5 (4b-8) to the power of 2008
Title, such as
Don't be scared by 2002 and 2008 in the title
The original formula is 3 (3a + 2) ^ 2002 + 5 (4b-8) ^ 2008 = 0
3(3a+2)^2002>=0 5(4b-8)^2008〉=0
If the original formula holds, there must be 3 (3a + 2) ^ 2002 = 5 (4b-8) ^ 2008 = 0
The solution is a = - 2 / 3, B = - 2
a^b=9/4
Let u = R, set a = {x | x2 + 3x + 2 = 0}, B = {x | x2 + (M + 1) x + M = 0}; if (CUA) ∩ B = &;, find the value of M. why can't b be equal to &;
If B is an empty set, then (M + 1) &# 178; - 4m is satisfied