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Karo-lina-s [1.5K]
3 years ago
5

Factor-20x2 + 13x + 21. How do you solve this

Mathematics
1 answer:
zaharov [31]3 years ago
5 0

Answer:

-3(9x-7)

Step-by-step explanation:

first multiply

20x2=40  

and now its -40x+13x+21

then add same variables

-40x+13x=-27x

now its -27x+21

then rewrite the equation

3 x 7=21

-3 x 9x = 27x

now its (-3 x 9x) + (3 x 7)

then the multiply thingy and you got the answer

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Twice Jack's age plus 5 is 21. Write and solve an equation. How old is Jack?
Aleksandr-060686 [28]
2j+5=21
2j=16
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<span>Jack is 8 years old.
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Find f”(x)=(3x^4+2)^5
Sidana [21]

Answer:

180x²(3x⁴+2)⁴+240x³(3x⁴+2)³

Step-by-step explanation:

we need to break this up using the chain rule

(3x⁴+2)=u

so we have

So now we take 3x⁴+2 and take the derivative (which I will assume you know how to do, if not lmk)

which is 12x³

we now need to take the derivative of u⁵=5u⁴

Mulitply these together

60x³u⁴=60x³(3x⁴+2)⁴

do the same thing again

60x³u⁴

we now need to do the mulitplication rleu

(60x³)'(u⁴)+(60x³)(u⁴)'

=

180x²u⁴+60x³*4u³

simplify

180x²(3x⁴+2)⁴+240x³(3x⁴+2)³

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4 0
3 years ago
Solve the equation: [3255] [x1 x2] + [1 2] = [2 -3]​
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Step-by-step explanation:

5 0
3 years ago
1. the sum of the first n odd positive integers is 64. what is the value of n ?
chubhunter [2.5K]
  • The value of the n is 8.
  • There are 7 positive integers between 100 and 200 which are divisible by 14.

<u>Step-by-step explanation:</u>

The sum of first n odd positive integer is n^2. The nth odd number is 2n-1.

                          i.e. 1 + 3 + ........+ (2n-1) = n^2.  

                                1 + 3 +..........+ (2n-1) = 64

                                                                n^2 = 64

                                                                    n = 8.

The positive integers between 100 and 200 which are divisible by 14 are 112, 126, 140, 154, 168, 182, 196. It is obtained by the multiples of 14 between 100 and 200.

100 = 7 * 14 + 2

200 = 14 * 14 + 4. The answer is 14 - 7 = 7

The seven numbers are

                        14 * 8 = 112

                        14 * 9 = 126

                        14 * 10 = 140

                        14 * 11 = 154

                        14 * 12 = 168

                        14 * 13 = 182

                        14 * 14 = 196

6 0
3 years ago
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