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Gennadij [26K]
2 years ago
10

Find the value of 2a² + 5b² when a= -6 and b= 2

Mathematics
2 answers:
sashaice [31]2 years ago
4 0
2(-6^2)+5(2^2)
2(36)+5(4)
72+20
92
poizon [28]2 years ago
3 0
Plug in the values -6 into 'a' and 2 into 'b'. 

2a² + 5b² 
2(-6)² + 5(2)²
First solve the exponents  ⇒  -6² means -6 * -6, which equals 36
2² = 2*2 = 4

2(36) + 5(4)
2*36 → 72
5*4 = 20
72 + 20 = 92  

Final answer → 92

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3x + 2y = 4 and -2x + 2y = 24? *
cluponka [151]

Answer:

x=28

y=v7vub8b9nf7v6v

3 0
2 years ago
What is the SURFACE AREA of the pyramid?
Tamiku [17]

Answer:

85in²

Step-by-step explanation:

s = side

triangle: ((b x h) ÷ 2) x 4

((5 x 6) ÷ 2) x 4 = 60in

square: s2(squared not 2)

5² = 25

total sa: 25 + 60 = 85in²

5 0
3 years ago
Qual o resultado da subtração dos dois polinômios abaixo? (2x2 + 4x) (–2x2 + x – 6)
Len [333]

Answer:

-4x^4-6x^3-8x^2-24x

Step-by-step explanation:

\left(2x^2+4x\right)\left(-2x^2+x-6\right)\\

distribuir parênteses

=2x^2\left(-2x^2\right)+2x^2x+2x^2\left(-6\right)+4x\left(-2x^2\right)+4xx+4x\left(-6\right)

Aplicar regras de menos mais ;+\left(-a\right)=-a

=-2\times\:2x^2x^2+2x^2x-2\times\:6x^2-4\times\:2x^2x+4xx-4\times\:6x

simplificar

-2\times\:2x^2x^2+2x^2x-2\times\:6x^2-4\times\:2x^2x+4xx-4\times\:6x:\\\quad -4x^4-6x^3-8x^2-24x

7 0
3 years ago
Find all the critical values
Natalija [7]
              y - 3
g(y) = ------------------
            y^2 - 3y + 9

To find the c. v., we must differentiate this function g(y) and set the derivative equal to zero:
     
             (y^2 - 3y + 9)(1) - (y - 3)(2y - 3)
g '(y) = --------------------------------------------
                    (y^2 - 3y + 9)^2

Note carefully:  The denom. has no real roots, so division by zero is not going to be an issue here.  

Simplifying the denominator of the derivative, 

(y^2 - 3y + 9)(1) - (y - 3)(2y - 3)  =>  y^2 - 3y + 9 - [2y^2 - 3y - 6y + 9], or
                                                         -y^2 + 6y

Setting this result = to 0 produces the equation y(-y + 6) = 0, so
y = 0 and y = 6.  These are your critical values.  You may or may not have max or min at one or the other.
6 0
3 years ago
Porter's bird feeder holds 1/2 of a cup of birdseed. Porter is filling the bird feeder with a scoop that holds 1/10 of a cup. Ho
Arlecino [84]

Answer:

5 scoops

Step-by-step explanation:

If the feeder already has 1/2 cups in it, Porter will need to put 5 scoops in because 5/10= 1/2. 5 is half of ten

Hope this helps!

3 0
2 years ago
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