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Rufina [12.5K]
3 years ago
11

Which expression is equivalent to

Mathematics
2 answers:
antoniya [11.8K]3 years ago
3 0
I'm pretty sure its B. (9x2+2x-7)(x)+(9x2+2x-7)(-4)
Because its just splitting up the (x-4) and if you add the answers together then you get the same answer as the original<span />
jolli1 [7]3 years ago
3 0

Answer:

B.(9x^{2}+2x-7)(x)+(9x^{2}+2x-7)(-4)

Step-by-step explanation:

Given two expressions between parentheses that are multiplying between them, we can find the equivalent expression if we distribute the terms between them. For example :

The expression (a+b).(c+d) is equivalent to

(a+b).(c+d)=ac+ad+bc+bd because we multiply the first element of the first expression (a+b) by the first element of the second expression (c+d) and then we sum the product between the first element of the expression (a+b) and the second element of the second expression (c+d).Then, we sum the product of the second element of the expression (a+b) and the first element of (c+d) and finally we sum the product of the second element of (a+b) and the second element of (c+d) in order to find the equivalent expression of (a+b).(c+d).

In the exercise :

(9x^{2}+2x-7).(x-4)=(9x^{2})x+(9x^{2})(-4)+(2x)x+(2x)(-4)+(-7)x+(-7)(-4)

Rearranging the expression we obtain :

(9x^{2})x+(2x)x+(-7)x+(9x^{2})(-4)+(2x)(-4)+(-7)(-4)

Factoring the expression :

(9x^{2}+2x-7)(x)+(9x^{2}+2x-7)(-4)

The correct answer is B.

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A quadrilateral has angles 60,60,120 and 120
slavikrds [6]

Answer:

<h2><u><em>Rhombus</em></u></h2><h2><u><em>Isosceles Trapezium</em></u></h2><h2><u><em>Parallelogram</em></u></h2>

Step-by-step explanation:

A quadrilateral has angles 60,60,120 and 120

write down the names of three possible quadrilaterals that can have these angles

  1. Rhombus
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4 0
1 year ago
Maria needs to buy 12 wine glasses. write an expression of the cost of 12 glasses at p dollars each.
irinina [24]

12p thats it because you are buying 12 glasses a the cost of p example 12 glasses for 5 dollars would be 12(5)=60

5 0
3 years ago
(-3, -7). 1/7 what is the equation in point slope form
Citrus2011 [14]

Answer:

y+7 = 1/7(x+3)

Step-by-step explanation:

Point slope form of a line is given by

y-y1 = m(x-x1)

where m is the slope and (x1,y1) is a point on the line

(y -  -7) = 1/7(x - -3)

y+7 = 1/7(x+3)

6 0
2 years ago
I need help with #10.
abruzzese [7]

Answer:

#10=10

Step-by-step explanation:

5 0
3 years ago
3x-(2x-1)=7x-(3*5x)+(-x+24)
Paraphin [41]

Answer:

\boxed{\boxed{\sf x=\frac{23}{10}}\: \sf or \:\boxed{x=2.3}}

_________________

\boxed{\sf Step\: By\:Step:- }

\sf 3x-\left(2x-1\right)=7x-\left(3\times \:5x\right)+\left(-x+24\right)

<u>Remove the parentheses:</u>

\to\sf 3x-\left(2x-1\right)=7x-3\times \:5x-x+24

<u>Combine like terms:</u>

\sf ^*7x-x=6x

\to\sf 3x-\left(2x-1\right)=6x-3\times \:5x+24

<u>Multiply 3 and 5x = 15x:-</u>

\to\sf 3x-\left(2x-1\right)=6x-15x+24

<u>Combine like terms:</u>

\sf ^*6x-15x=-9x

\to\sf 3x-\left(2x-1\right)=-9x+24

<u>Expand: 3x-(2x-1)= x+1</u>

\to\sf x+1=-9x+24

<u>Subtract 1 from both sides:</u>

\to\sf x+1-1=-9x+24-1

\to\sf x=-9x+23

<u>Add 9x to both sides:</u>

\to\sf x+9x=-9x+23+9x

\to\sf 10x=23

<u>Divide both sides by 10:</u>

\to\sf \cfrac{10x}{10}=\cfrac{23}{10}

\to\sf x=\cfrac{23}{10}

<u>________________________________</u>

3 0
2 years ago
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