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zlopas [31]
3 years ago
14

How can Help me (a+b)^2≥4ab

Mathematics
2 answers:
irga5000 [103]3 years ago
8 0

Answer:

(a+b) ²≥4ab explanation below↓↓↓↓

Step-by-step explanation:

We know that

(a-b) ²≥0

a²-2ab+b²≥0

Move -2ab to the other side

a²+b²≥2ab

Add 2ab to both sides

a²+2ab+b²≥4ab

(a+b) ²=a²+2ab+b² therefore :

(a+b) ²≥4ab

sattari [20]3 years ago
5 0

Mark as brainlist___________________________________

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Given that <br> f(n) = n^2 - 4n + 3 <br> &amp; g(n) = 2n - 1<br> find gf(-2)
icang [17]

Answer:

The value of gf\left(-2\right) will be:

  • gf\left(-2\right)=29

Step-by-step explanation:

Given the functions

f(n) = n^2 - 4n + 3

g\left(n\right)\:=\:2n\:-\:1

f\left(-2\right)\:=\:\left(-2\right)^2\:-\:4\left(-2\right)\:+\:3

           =\left(-2\right)^2+4\cdot \:2+3

           =2^2+4\cdot \:2+3

            =2^2+8+3

            =4+11

            =15

so

gf\left(-2\right)=g\left(15\right)

             =2n-1=2\left(15\right)-1=30-1=29

Therefore,

  • gf\left(-2\right)=29

3 0
3 years ago
Jessica invests​ $250 each quarter in an ordinary annuity with a​ 5% interest rate compounded quarterly. Determine the accumulat
madam [21]

Answer:

Step-by-step explanation:

Usimg formula for calculating compound interest.

A = P(1+r/n)^nt

P is the principal =$250

r is the rate = 5%

t is the time = 25years

n = 1/4(compounded quarterly)

Substituting to get the amount A.

A = 250(1+5/25)^25/4

A = 250(1+0.2)^6.25

A = 250(1.2)^6.25

A = 250(3.125)

A = $781.31

Hence the accumulated amount in​ Jessica's annuity after 25 years is $781.31

4 0
4 years ago
If PQRS is a kite, find m angle Q
balu736 [363]

Answer:

m<Q = 78°

Step-by-step explanation:

First, find the value of x:

7x + 2 = 10x - 31 (Non-vertex angles of a kite are congruent to each other)

Collect like terms

7x - 10x = -2 - 31

-3x = -33

Divide both sides by -3

x = 11

Find m<Q:

Sum of all angles in a kite = 360°

Therefore,

m<Q + m<P + m<S + m<R = 360°

m<Q + (7x + 2) + 124 + (10x - 31) = 360

Plug in the value of x

m<Q + (7*11 + 2) + 124 + (10*11 - 31) = 360

m<Q + 79 + 124 + 79 = 360

m<Q + 282 = 360

Subtract 282 from both sides

m<Q + 282 - 282 = 360 - 282

m<Q = 78°

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Answer:

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Step-by-step explanation:

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