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marysya [2.9K]
3 years ago
13

An expression is shown below. Which expression is equivalent to the expression shown?

Mathematics
1 answer:
Vera_Pavlovna [14]3 years ago
6 0

Note: In option A, it should be "+" instead of "(".

Given:

The expression is

-2x(x+y-3)+3(-x+4y)+y(3x+5y-3)

To find:

The equivalent expression.

Solution:

We have,

-2x(x+y-3)+3(-x+4y)+y(3x+5y-3)

Using distributive property, we get

=-2x(x)-2x(y)-2x(-3)+3(-x)+3(4y)+y(3x)+y(5y)+y(-3)

=-2x^2-2xy+6x-3x+12y+3xy+5y^2-3y

On combining like terms, we get

=-2x^2+5y^2+(-2xy+3xy)+(6x-3x)+(12y-3y)

=-2x^2+5y^2+xy+3x+9y

The expression -2x^2+5y^2+xy+3x+9y is equivalent to the given expression.

Therefore, the correct option is A.

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The product (x) of two numbers is 24 and their sum (+) is 10. What is the value of the largest of the two numbers?
RideAnS [48]

let the two numbers be x and y

From the first sentence,

xy=24

x+y=10

Then make y in equation 2 the subject of the formular and substitute in equation 1

x+y=10

y=10-x

substituting in equation 2

x(10-x)=24

open the bracket

10x-x^2=24

=-x^2+10x=24

Transfer the constant to the left hand side

=-x^2+10x-24=0

Then factorise completely

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(6x² + 36x² + 12) ÷ (x+6)
astra-53 [7]

Answer:

=42x2+1

Step-by-step explanation:

6x2+36x2+12x+6

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Use compatible numbers to find two estimates: 17 ÷1569
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I dont know what you mean but i devided 17 and 1569 and it =s 0.0108349267
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Can someone pls help ​
Basile [38]

Answer:

15x - 2.

Step-by-step explanation:

3x - 1 + 2x + 1 + 4x - 2 + 4x - 4 + 2x + 4

= 15x - 2.

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Answer:

1. 11(2r+1

2.16(2+1)

3.9(c+4)

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