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Usimov [2.4K]
3 years ago
6

What are the solutions to x2 -8x =13

Mathematics
2 answers:
zysi [14]3 years ago
8 0

Answer:

See image below for answer:)

Step-by-step explanation:

Monica [59]3 years ago
7 0
X2 - 8x + 16 = 13 + 16
(x - 4)^2 = 29
x - 4 = sr(29)
x = 4 +- sr(29)
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4 points Item 5 is unpinned. Click to pin. A cylindrical oil drum is 2.1 meters high and has a radius of 0.9 meters. How many cu
pashok25 [27]

Answer:

53.44 cubic meters

Step-by-step explanation:

A cylindrical oil drum is 2.1 meters high and has a radius of 0.9 meters. How many cubic meters of oil can the drum hold? (volume)

Volume of a cylinder = π × r² × h

r = 0.9 meters

h = 2.1 meters

= π × (0.9m)² × 2.1m

= 53.44 cubic meters

Therefore, the volume of the cylindrical oil drum = 53.44 cubic meters

7 0
3 years ago
What are the solutions of the equation x4 - 9x2 + 8 = 0? Use u substitution to solve.
Sedbober [7]

Answer:

\large\boxed{B.\ x=\pm1\ and\ x=\pm2\sqrt2}

Step-by-step explanation:

x^4-9x^2+8=0\\\\x^{2\cdot2}-9x^2+8=0\qquad\text{use}\ (a^n)^m=a^{nm}\\\\(x^2)^2-9x^2+8=0\\\\\text{substitute}\ x^2=t\geq0\\\\t^2-9t+8=0\\\\t^2-t-8t+8=0\\\\t(t-1)-8(t-1)=0\\\\(t-1)(t-8)+0\iff t-1=0\ \vee\ t-8=0\\\\t-1=0\qquad\text{add 1 to both sides}\\t=1\geq0\\\\t-8=0\qquad\text{add 8 to both sides}\\t=8\geq0

t=x^2\to x^2=1\ \vee\ x^2=8\\\\x^2=1\Rightarrow x=\pm\sqrt1\to x=\pm1\\\\x^2=8\Rightarrow x=\pm\sqrt8\to x=\pm\sqrt{4\cdot2}\to x=\pm\sqrt4\cdot\sqrt2\to x=\pm2\sqrt2

4 0
3 years ago
Read 2 more answers
PLEASE HELPPPPPPP ASAPPP
Shalnov [3]

Answer:

6 units

Step-by-step explanation:

distance between (-2,-2) and (4,-2)

distance formula,

√(x2-x1)²+(y2-y1)²

x2=4

x1=-2

y1=-2

y2=-2

putting the values,

√(4+2)²+(-2+2)²

√6²+0²

6 units

4 0
3 years ago
The costs of different weights of onions sold at a grocery store are shown in the table
lana66690 [7]

Answer:

<h2>Independent variable: Weight of Onions.</h2><h2>Dependent variable: Total Cost.</h2>

Step-by-step explanation:

The given table is about the weight of onions in pounds and the total cost.

If you think this through, you would notice that the total cost depends on the number of pounds of onions. That means the independent variable is Weight of Onions and the dependent variable is the Total Cost.

So, to put it in a sentence: The weight of onions determines the total cost.

8 0
3 years ago
Read 2 more answers
Find the equation of the line with slope of 4 and y-intercept of -3.
Lelechka [254]

Answer:

y = 4x -3

Step-by-step explanation:

The slope intercept form of an equation is

y = mx+b where m is the slope and b is the y ntercept

y = 4x -3

3 0
3 years ago
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