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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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Kal is making 3 batches of cookies. Each batch calls for 3/4 cups of sugar. How much sugar will Kal use for all 3 batches?
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Answer:

2 1/4 cups of sugar

Step-by-step explanation:

You could change 3/4 to a decimal which is .75

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How many solutions does this system of equations have?
guajiro [1.7K]

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1 solution

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4 0
3 years ago
Read 2 more answers
What is two more than 4 times a number is -18 translated and solved
Brrunno [24]

Answer:

n=-5

Step-by-step explanation:

Let "n" represent the unknown number.

So, the equation asks for 4n and two more, or +2, that is all equal to -18.

So, your equation will be:

4n+2=-18

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Then, divide both sides by 4:

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Therefore, n=-5.

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