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DIA [1.3K]
3 years ago
14

What is the value of the expression (2x + y) (2x - y) when x = 4 and y = -5?

Mathematics
2 answers:
Gemiola [76]3 years ago
5 0

Answer:

39

Step-by-step explanation:

1. (2(4)-5)(2(4)+5)

2.(3)(13)

3.39

NikAS [45]3 years ago
4 0

Answer:

Step-by-step explanation:

This is a difference of squares question. You should 64 = 25 = 39 Let's see if that happens.

Difference of squares

(2x - y) ( 2x + y) = 4x^2 - y^2

4(4)^2 - (5)^2

64 - 25 = 39

Now do the question exactly as it is written.

(2*4 - -5)(2*4 + -5)

(8 +5)(8 - 5)

3 * 13

39

They really do give the same answer.

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Help me help me help me help me pls
ivolga24 [154]

Answer:

b

Step-by-step explanation:

y = -4/3x + 4

7 0
3 years ago
Read 2 more answers
Help me to solve this question. Show me the steps also.<br><br><br>:)
zysi [14]
Could it possibly be 5?? I don't quite understand this question
5 0
4 years ago
Lia has 7 blue pencils and 28 red pencils. Maria has 14 blue pencils and 42 red pencils, and Tia has 10 blue pencils and 30 red
Diano4ka-milaya [45]
Lia's ratio = 7/28 = 1/4
Maria's ratio = 14/42 = 1/3
Tia's ratio = 10/30 = 1/3

In short, Maria and Tia have same ration of blue to red pencils

Hope this helps!
7 0
3 years ago
If y’all can help with this one it’s imagine 2 i’m trying to figure out
Sindrei [870]

Answer:

I think it would be D. I'm not sure but I think so. I thought C at first but (go to explanation)

Step-by-step explanation:

if image 1 is the original, then image 2 would be it reflected over the y axis

C says over the line y=0 which would be a horizontal line. x=0 would be a vertical line aka the y axis. I believe its D.

8 0
3 years ago
Michael is 17 year older than john.In 4 years,the sum of their ages will be 49.Find Michael's present age.​
grin007 [14]
Michael's present age is 53

Step-by-step

17-4=13

John is 13

than when John will be 49

u add 4 to 49

4+49=53

so Michael is 53 because he is 4 years older :)
8 0
4 years ago
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