Explain how to complete the square for an expression of the form x2+bx .

Mathematics

1 answer:

pochemuha3 years ago

6 0

Answer:

To complete the square on an expression of the form x2 + bx, add . Then the expression becomes . Let's look at an example using numbers instead of an area model. We'll complete the square for the binomial .

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PLEASE HELP OMG

kirill [66]

Y = mx + b

7x + 8y = -12
Subtract 7x from both sides
8y = -7x - 12
Divide each side by 8
y = -7/8x - 12/8
Simplify
y = -7/8x - 3/2

So besides simplifying, if I’m doing this correctly, it should be correct.

4 0

3 years ago

Arrange these lunch buyers from greatest to least assuming they buy lunch 5 days per week: Alice spends $3 per day, Betty spends

ValentinkaMS [17]

Alice spends $3 per day, so for in a week and upto 5 weeks, Alice spend =$3*5*5 = $75

Betty spends $ 25 every 2 weeks, so for 5 weeks , she spends= 25+25+12.5

= $62.5

Cindy spends $ 75 per month, and on an average there are less then 5 weeks in a month . SO for 5 week, it must be greater than $75 .

So the order is

Cindy>Alice>Betty

3 0

3 years ago

How do you substitute x+7y=0 into 2x-8y=22

Grace [21]

First solve for x in the first equation

x + 7y = 0
x = -7y

since x = -7y we can substitute -7y into the other equation wherever there is an x

2x - 8y = 22
2(-7y) - 8y = 22
-14y - 8y = 22
-22y = 22
y = -1

Now let's substitute -1 back into either of the original equations so we can solve for x

x + 7y = 0
x + 7(-1) = 0
x - 7 = 0
x = 7

So your solution set is

(7, -1)

5 0

4 years ago

I need help on this question can someone help x(x-2)

Anestetic [448]

X * (x-2) = x*x - 2*x = $x^{2}$ - 2x