How do you solve 4x^2-12x=7 algebraically

Answers

Answer 1

Answer: (if you don't wanna read all this the answer is at the bottom btw)

move the 7 over to equate the equation to 0

4x^2 - 12x -7 = 0

(ok now you have a (4), b (-12), and c (-7) here you can either use the quadratic formula to solve it or factor the equation)

to factor it, you have to multiply a and c (4*-7 = -28) and find two numbers that multiply to -28 and add to -12

the numbers are -14 and 2. sub those into the equation in place of b

4x^2 + 2x - 14x - 7 = 0

find the lcd of the first two terms and the last two terms to factor them

2x(2x + 1) - 7(2x+1) = 0
(2x -7) (2x+1) = 0
(x-7/2)(x+1/2) = 0

to find the two x values you need to find what values make the equation equal 0 on both sides.

so x is 7/2 or -1/2

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A square has an area of 49 square meters. What is the perimeter of the square? 1) 28 meters 2) 30 meters 3) 32 meters 4) 36 meters

Answers

Answer:

1)28

Step-by-step explanation:

The area of square=49m^2

or,L^2=49

i.e. L=7

also perimeter =4L

or, =4×7

or, perimeter=28m

On a particular day, the wind added 2 miles per hour to Jaime's rate when she was rowing with the wind and subtracted 2 miles per hour from her rate on her return trip. Jaime found that in the same amount of time she could row 44 miles with the wind, she could go only 36 miles against the wind.What is her normal rowing speed with no wind?

Answers

Answer:20

Step-by-step explanation:

Given Wind speed is 2 mile/hr

Let jamie speed be x km/hr

Also she covered 44 miles with wind in time t

$44=\left ( x+2\right )t$

Against the wind

$36=\left ( x-2\right )t$

divide the two equations

$(44)/(36)=(x+2)/(x-2)$

11x-22=9x+18

x=20 miles/hr

It is 40 because it gives you the even rate inbetween each of them

Find the area of the semicircle need help asapp

Answers

Answer:

2 pi

Step-by-step explanation:

The radius is 2

The area of a circle is

A = pi r^2

We have 1/2 of a circle so

1/2 A = 1/2 pi r^2

=1/2 pi ( 2)^2

=1/2 pi *4

= 2 pi

Arun has captured many yellow-spotted salamanders. He weighs each and then counts the number of yellow spots on its back. This trend line is a fit for these data. A. negative

B. weak

C. parabolic

D. strong

Answers

Answer: D. Strong

Step-by-step explanation:

Correct on A P E X

Ignore the first answer

Plz halp i need to get this right.

Answers

Answer:

Step-by-step explanation:

Ricardo read that it may be unhealthy to eat more than 5,500 mg of table salt (NaCl) in a day. He wants to see how much salt 5,500 mg is, but his scale only weighs in units of grams.How many grams of salt should he measure out on the scale?
0.055 g
55 g
550 g
5.5 g

Answers

Answer:

5.5 grams

Step-by-step explanation:

i did it on study island

sorry, we haven't studied that yet :(

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