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rosijanka [135]
3 years ago
12

What do you guys think I’d the best answer

Mathematics
1 answer:
OLga [1]3 years ago
5 0

Answer:

9

Step-by-step explanation:

I belive this is the best answer

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Sergey is solving 5x2 + 20x – 7 = 0. Which steps could he use to solve the quadratic equation by completing the square? Select t
olya-2409 [2.1K]

Answer:

Step-by-step explanation:

\mathrm{For\:a\:quadratic\:equation\:of\:the\:form\:}ax^2+bx+c=0\mathrm{\:the\:solutions\:are\:}\\x_{1,\:2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}\\\mathrm{For\:}\quad a=5,\:b=20,\:c=-7:\quad x_{1,\:2}=\frac{-20\pm \sqrt{20^2-4\cdot \:5\left(-7\right)}}{2\cdot \:5}\\x=\frac{-20+\sqrt{20^2-4\cdot \:5\left(-7\right)}}{2\cdot \:5}:\quad \frac{-10+3\sqrt{15}}{5}\\x=\frac{-20-\sqrt{20^2-4\cdot \:5\left(-7\right)}}{2\cdot \:5}:\quad -\frac{10+3\sqrt{15}}{5}\\

\mathrm{The\:solutions\:to\:the\:quadratic\:equation\:are:}\\x=\frac{-10+3\sqrt{15}}{5},\:x=-\frac{10+3\sqrt{15}}{5}

7 0
3 years ago
Read 2 more answers
What is the volume of the right rectangular prism?
kenny6666 [7]

Answer:

240

Step-by-step explanation:

V=width height  length  = 10 · 3 · 8 = 240

Hope this helped, have a wonderful day man!

4 0
3 years ago
Read 2 more answers
What is the equation for this?
worty [1.4K]

The point-slope form:

y-y_1=m(x-x_1)\\\\m=\dfrac{y_2-y_1}{x_2-x_1}

We have two points (-9, 7) and (9, 1). Substitute:

m=\dfrac{1-7}{9-(-9)}=\dfrac{-6}{18}=-\dfrac{1}{3}\\\\y-7=-\dfrac{1}{3}(x-(-9))\\\\\boxed{y-7=-\dfrac{1}{3}(x+9)}

5 0
3 years ago
Writing and Graphing Inequalities, I need help pleaseeeeeee
Feliz [49]

Answer:

you would put a closed circle of 2 and a ray pointing right

Step-by-step explanation:

7/3 is equal to 2.33

Im not sure if you are suppose to round it but it would make more sense if you did.

so we round it to 2

you would put a closed circle of 2 and a ray pointing right

This means that the value of z is   or greater than 2

3 0
3 years ago
Read 2 more answers
Helpppp!! i need work and the answer!!
xxTIMURxx [149]

500 - 125 = 375

72.50 × 6 = 435

435 - 375 = 60.

Divide the part (60) by the whole (500) then multiply by 100 to get the percent.

60 / 500 = .12

.12 × 100 = 12%

The correct answer is B

5 0
4 years ago
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