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3 years ago

Simplify: 3x – 5 + 23x – 9 a. 2(14x -6) b. 3x(13x-6) c. 2(13x -7) d. 3x(13x - 5)

Mathematics

2 answers:

IceJOKER [234]3 years ago

6 0

Answer : 

Step-by-step explanation:

(a+b)(a-b) = a² - b²
a( b + c) = ab + ac
a (b - c) = ab - ac
a( b + c) + d( b + c) = (a + d) (b + c)

3x – 5 + 23x – 9 = 26x - 14

2 . 13x = 26x

2. -7 = -14

2 ( 13x -7) so answer is C

or another way :

a. 2(14x -6) = 28x - 12

b. 3x(13x-6) = 39x² - 18x

c. 2(13x -7) = 26x - 14

d. 3x(13x - 5) = 39x² -15x

so answer is C

Hope this helps ^-^

Vilka [71]3 years ago

4 0

Step-by-step explanation:

3x-5+23x-9

26x-5-9=26x-14

2(13x-7)

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Answer:

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Step-by-step explanation:

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2 years ago

Help me with the question in the pic please and thank u!

Zepler [3.9K]

Answer:

1.98

Step-by-step explanation:

In this problem, we are:

Given: ∠D = 26°, Hypotenuse (DF) = 4.5

To solve: EF

Now through the given, we are to focus on point D to solve for EF.

We need to find the relationship of point D to DF and EF.

The relationship here is sine.

Reason: $\frac{opposite}{hypotenuse}$

Through point D, DF is the hypotenuse and EF is the opposite side.

So let's solve this simply through algebra,

sin = $\frac{opposite}{hypotenuse}$

sin(26°) = $\frac{EF}{4.5}$

0.44 = $\frac{EF}{4.5}$

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1.98 = EF

7 0

3 years ago

A snail travels 10 cm in 4 minutes. At this rate: How long will it take the snail to travel 24 cm? minutes How far does the snai

vovangra [49]

Answer:

1) 9 min 36 sec (9.6min)

2) 15 cm

Step-by-step explanation:

10 cm -->4 min

1 cm --> 0.4 min

24cm --> 9.6 min

15 cm--> 6min

3 0

2 years ago

Read 2 more answers

The roots of a quadratic equation ax2+bx+c=0 are 3+sqrt2 and 3−sqrt2. Find the values of b and c assuming that a=1.

slamgirl [31]

Answer:

$b=-6\\c=7$

Step-by-step explanation:

we know that

The general equation of a quadratic function in factored form is equal to

$y=a(x-x_1)(x-x_2)$

where

a is a coefficient of the leading term

x_1 and x_2 are the roots

we have

$a=1\\x_1=3+\sqrt{2}\\x_2=3-\sqrt{2}$

substitute

$y=(1)(x-(3+\sqrt{2}))(x-(3-\sqrt{2}))$

Applying the distributive property convert to expanded form

$y=x^2-x(3-\sqrt{2})-x(3+\sqrt{2})+(3+\sqrt{2})(3-\sqrt{2})$

$y=x^2-(3x-x\sqrt{2})-(3x+x\sqrt{2})+(9-2)$

$y=x^2-3x+x\sqrt{2}-3x-x\sqrt{2}+7$

$y=x^2-6x+7$

therefore

$b=-6\\c=7$

7 0

2 years ago

Do you guys know the solution for these? I already have the answers but I need the solution

pantera1 [17]

To be honest i really dont know but if i have it i would tell u

4 0

2 years ago