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wel
2 years ago
5

How do I solve x² - 10x-3=0

Mathematics
1 answer:
evablogger [386]2 years ago
3 0

Answer:

x = 5±2√7

Step-by-step explanation:

This quadratic cannot be factorised via the factorisation method, so we use the quadratic formula :

x = \frac{-b + \sqrt{b^{2} -4ac} }{2a} or x = \frac{-b - \sqrt{b^{2} -4ac} }{2a}

(The reason I did 2 equations is because brainliest does not allow me to do the ± in the equation insert thing )

x = \frac{-(-10) + \sqrt{-10^{2} -4(1)(-3)} }{2(1)} or x = \frac{-(-10) - \sqrt{-10^{2} -4(1)(-3)} }{2(1)}

x = \frac{10  + \sqrt{100+12} }{2} or x= \frac{10  - \sqrt{100+12} }{2}

x = \frac{10  + {4\sqrt{7}} }{2} or x = \frac{10  -  {4\sqrt{7}} }{2}

x = 5+2\sqrt{7} or x = 5 -2\sqrt{7}

Hope this helped and brainliest please

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Name the angle relationship
Mice21 [21]

Answer:

Alternate interior

Step-by-step explanation:

8 0
3 years ago
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What is the value of the following expression 1.8 + 0.5(y + 6) - 2 t the power of 3 when y = 14?
aalyn [17]

Answer: The answer should be 38.

I also saw that you placed a t after the -2 so I wasn't sure if it was a mistake or if it was on purpose or you left another t out of the problem on accident.

Step-by-step explanation:

2.3   (14+6)   -2 to the power of three

2.3    (20)     -2 to the power of three

2.3     (20)     -8

    46-8

      38

I really hoped this helped and if I got it wrong with the t just reply to me c:

4 0
3 years ago
Explain in your own words why (x + y)2 ≠ x2 + y2. Provide a numerical example to illustrate.
bekas [8.4K]
Im not sure if you wrote this wrong because (x+y)2 does equal x2+y2. An example would be if x equals 3 and y equals 4 (3+4)2=(3)2+(4)2 (7)2=6+8 14=14.
6 0
3 years ago
Plz help with this math. Can't find the area of the triangular faces.
Zina [86]
First of all, you have to find the area of both triangles:
\frac{bh}{2}
\frac{4*4}{2}
Or just 16 because there are 2 of the same triangles.

Now you have to find the area of the 3 rectangles.

The two that are in the front are 4*3 (l*h) or 12*2 (because there are 2 congruent rectangles. The area of those rectangles is 24 square mm.

Now you find the area of the back rectangle:
5.7*3 = 17.1

Finally, you add all the found numbers to figure out the surface area.
17.1 + 16 + 24 = 57.1 square millimeters.

Hope this helped,
Loafly
4 0
3 years ago
HELP COLLEGE ALGEBRA
max2010maxim [7]

Answer:

1) \frac{-8}{11}  

2) 1.276

3) \frac{3}{4}

4) 0

Step-by-step explanation:

The slope formula of the line that pass across two points P1(x1,y1) and P2(x2,y2) is:

\frac{y2 - y1}{x2-x1} = slope

You can use this formula to solve all the four points:

1)

\frac{6- -2}{-9 - 2} = \frac{-8}{11}

2)

\frac{- 9.1 - 0.6}{-9.5 - - 1.9} = \frac{97}{76} =(Rounded)= 1.276

3)

\frac{2-5}{-2 -2} = \frac{3}{4}

4)

\frac{4-4}{-9 --4} = \frac{0}{-5} = 0 \\\\

3 0
3 years ago
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