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evablogger [386]
3 years ago
5

Hi I'm in 7th grade can someone help me with everything

Mathematics
1 answer:
kogti [31]3 years ago
5 0
Yes I can help you
What’s the problem or question you need help with?
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How do i express x^2-3x into the form of (x-m)^2+n. I will give brainliest to correct answer
mel-nik [20]

Step-by-step explanation:

let's simply do the multiplications and then compare with the original.

(x-m)² + n

right ?

or is it

{(x - m)}^{2 + n}

let's go for the first.

x² - 2mx + m² + n = x² - 3x

-2mx + m² + n = -3x

fun there we see two things :

-2m = -3

m = 3/2

and

m² + n = 0

(3/2)² = -n

9/4 = -n

n = -9/4

so our transformed expression looks like

(x - 3/2)² - 9/4

7 0
2 years ago
Alexei wants to hang a mirror in his boat and put a frame around it. The mirror and frame must have an area of 19.25 square feet
zhuklara [117]

Let

x---------> the thickness of the frame in feet

At-------> Area of the mirror and the frame in square feet

we know that

At=19.25ft^{2} ------> equation 1

At=(3+2x)*(5+2x)\\ At=3*5+3*2x+5*2x+2x*2x\\ At=15+6x+10x+4x^{2} \\ At=4x^{2} +16x+15--------> equation 2

equate equation 1 and equation 2

19.25=4x^{2} +16x+15\\ 4x^{2} +16x+15-19.25=0\\ 4x^{2} +16x-4.25=0

therefore

the answer is the option

C. 4x2 + 16x - 4.25 = 0

5 0
3 years ago
Read 2 more answers
Help meeeee!!!!!!! I’ll give you a cookie.
lianna [129]

Answer:

(-5,24)

Step-by-step explanation:

2f+3g-h

first we substitute in the numbers

2(-3)+3(1)-2

-6+3-2

-3-2

-5

Then again

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

10+12+2

22+2

24

hope this helps!:)

7 0
3 years ago
Solve this problem <br> 3d+d-7=25/4
creativ13 [48]
If that 25/4 is a fraction them the answer is 53/4. Or in simplest form 3 5/16 or 3.3125
4 0
3 years ago
Read 2 more answers
This for whoever wants to get 15 points for free.......Your welcome
Kobotan [32]

Answer:THANK YOUUUUUUU

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
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