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frez [133]
3 years ago
5

Solve 2x^2 – 8x = –7

Mathematics
2 answers:
Goshia [24]3 years ago
6 0
Making one side of the equation zero, the equation becomes,
                                  2x² - 8x + 7 = 0
The value of x may be calculated through the quadratic formula.
                                  x = (-b +/- sqrt(b² - 4ac)) / 2a
where a, b, and c are 2, -8, and 7, respectively. The values are,
                  x = (8 + sqrt (8² - (4)(2)(7))) / 2x2 = -1.29
                 <span> x = (8 - sqrt (8² - (4)(2)(7))) / 2x2 = -2.71</span>
svetoff [14.1K]3 years ago
3 0
\displaystyle 2x^2 - 8x = - 7 \\ \\ 2x^2-8x+7=0 \\ \\  \Delta=b^2-4ac \\ \\ \Delta=(-8)^2-4\cdot2\cdot7 \\ \\  \Delta = 8 \\ \\ X_{1,2}= \frac{-b\pm \sqrt{\Delta} }{2a}  =  \frac{8 \pm 2 \sqrt{2}  }{4} =  \frac{\not2(4\pm \sqrt{2}) }{\not4} = \frac{4\pm \sqrt{2} }{2}
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Which property is illustrated by the following ? <br>if r = -12, then r - 16 = -28​
kondor19780726 [428]
Additive Property of Equality, sometimes called the Addition Property of Equality.

You can add or subtract the same value from both sides of the equation and still maintain the equality.
4 0
2 years ago
There is a ratio of 5 boys to 11 girls in our class. What is the total number of students if there are 6 boys?​
grandymaker [24]

Answer:

12??

Step-by-step explanation:

3 0
2 years ago
Two equations are given below:
ycow [4]
Hello,

a-3b=4 (1)
a-b=-2 (2)

(1)-(2)==> -2b=6
=>b=-3 and a=-2+(-3)=-5

Answer D


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



8 0
3 years ago
Arthur is interested in the effects of sleep deprivation usage on number of calories consumed. He asks a group of 20 college stu
Greeley [361]

Answer:

Arthur knows that there is a difference among the groups somewhere, but he does not know where

Step-by-step explanation:

An ANOVA test is a test to find out whether the results of an experiment or a survey are significant or not. ANOVA test helps the researcher or the experimenter to decide whether they reject the null hypothesis or accept the alternate hypothesis in the experiment. In ANOVA test, the experimenter wants to find if there is a difference between them or not.

In the context, Arthur is doing a study and he wishes to find out effect of a sleep deprivation on the number of the calories that people consumed. He collects some data from his subject group from the sleep lab and after running the ANOVA test, he finds out that he can reject the null hypothesis. So on this basis, Arthur knows that there is some basic difference among the members of the group somewhere, but he does not know where actually the difference is.

3 0
3 years ago
PLEASE HELP WILL NAME BRAINLIEST NO LINKS PLEASE
Valentin [98]

Answer:

Step-by-step explanation:

First, you should put the axis of symetry as 5, -7 because f(x)= (x-h)^2+k and h is 5 and k is -7. the axis of symetry is x=5 because that is the "folding point" of the graph. Next, you would have to plug In 4 and 6 as your helping points to tell you where the other points of the function are going to be.

Plug 4 in and you get -6. plug 6 in and you get -6. plot the points (4, -6) and (6,-6).

Hope this helps!

:)

3 0
3 years ago
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