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Andre45 [30]
3 years ago
15

X ^ 2 + 4x - 7 = 0 Solve using the Quadratic Formula

Mathematics
1 answer:
aalyn [17]3 years ago
8 0

There's a special case of the quadratic formula called the Shakespeare Quadratic Formula (2b or -2b) that applies when the linear coefficient is even.

x^2-2Bx + C \textrm{ has zeros }x = B \pm\sqrt{B^2 - C}

If you're planning on solving a lot of quadratic equations quickly, it's good to know.

Here we have

x^2 + 4x - 7 = 0

so

x = -2 \pm \sqrt{2^2 - -7}

x = -2 \pm \sqrt{11}

You might be interested in
Somebody please help me!!
Finger [1]
= -35 + 7 - 15
= -43

hope it helps

7 0
3 years ago
For a sample of eight bears, researchers measured the distances around the bears' chests and weighed the bears. Minitab was used
kkurt [141]

Answer:

Kindly check explanation

Step-by-step explanation:

Given that :

Correlation Coefficient (r) = 0.989

alph=0.05

Number of observations (n) = 8

determine if there is a linear correlation between chest size and weight.

Yes, there exists a linear relationship between chest size and weight as the value of the correlation Coefficient exceeds the critical value.

What proportion of the variation in weight can be explained by the linear relationship between weight and chest size?

To determine the the proportion of variation in weight that can be explained by the linear regression line between weight and chest size, we need to obtain the Coefficient of determination(r^2) of the model.

r^2 = square of the correlation Coefficient

r^2 = 0.989^2 = 0.978121

Hence, about 0.978 (97.8%) of the variation in weight can be explained by the linear relationship between weight and chest size.

4 0
3 years ago
The tires on your bicycle have a radius of 14 inches. How many rotations does each tire make when you travel 900 feet? Round you
Nezavi [6.7K]

Around  150 rotations

I rounded the radius to feet which is 1 foot. Then you have to get the diameter which is 1x2=2. The diameter is 2 feet. Now for the circumference, we multiply 2 by 3.14(which is pi). The answer to that is 6.28, and since we are rounding it, we get 6 feet. However, we are traveling 900 feet. Divide 900 by 6 and get 150.

8 0
3 years ago
Write 0.96 as a fraction in simplest form.<br> 0.96 =
ra1l [238]

Answer:

24/25

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Can anyone help me on 4,7,10<br> Using simplest form
dezoksy [38]
I will give the answers, you can comment any questions! Glad to help you!!!

4.) 7/8

7.) 9/10

10.)1 1/6

Hope this helps!

Comment any questions!
7 0
3 years ago
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