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Anton [14]
3 years ago
14

Solve for x 8(x+9)= -9x+21

Mathematics
2 answers:
Alona [7]3 years ago
8 0

Answer:

-3

Step-by-step explanation:

LenaWriter [7]3 years ago
4 0

Answer:

x = -3

Step-by-step explanation:

Isolate the variable by dividing each side by factors that don't contain the variable.

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The roots of the quadratic equation $z^2 + az + b = 0$ are $2 - 3i$ and $2 + 3i$. What is $a+b$?
AlladinOne [14]
We know for our problem that the zeroes of our quadratic equation are (2-3i) and (2+3i), which means that the solutions for our equation are x=2-3i and x=2+3i. We are going to use those solutions to express our quadratic equation in the form a x^{2} +bx+c; to do that we will use the <span>zero factor property in reverse:
</span>x=2-3i
x-2=-3i
x-2+3i=0
<span>
</span>x=2+3i
x-2=3i
x-2-3i=0
<span>
Now, we can multiply the left sides of our equations:
</span>(x-2+3i)(x-2-3i)= x^{2} -2x-3ix-2x+4+6i+3ix-6i-3^2i^2
<span>= </span>x^{2}-4x+4-9i^{2}
= x^{2} -4x+4+9
= x^{2} -4x+13
Now that we have our quadratic in the form a x^{2} +bx+c, we can infer that a=1 and b=-4; therefore, we can conclude that a+b=1+(-4)=1-4=-3.
6 0
4 years ago
In a certain game, a large container is filled with red, yellow, green, and blue beads worth, respectively, 7, 5, 3, and 2 point
Liono4ka [1.6K]
Idk this but it might be the points
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What is the percent for .3?
STatiana [176]
There are 2 ways to turn a number into a percent...

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(2) multiply by 100....0.3 x 100 = 30%
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Hi, I need some help with the last question of the first problem and the answer to the second page.
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Step-by-step explanation:

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Solve the Expression<br> 5-(2*8)+14=
evablogger [386]

Answer:

3

Step-by-step explanation:

5 0
3 years ago
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