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Alenkinab [10]
3 years ago
5

For what values of x is the following equation satisfied : 3x+9 = 21+7x ?

Mathematics
2 answers:
olya-2409 [2.1K]3 years ago
4 0
First of all, the first power of 'x' is the highest power in the whole equation,
so we only expect one solution.

You said that <span><u>3x+9 = 21+7x </u>

Subtract 3x from each side:

9 = 21 + 4x

Subtract 21 from each side:

-12 = 4x

Divide each side by 4 :

<u>-3 = x </u>
</span>


algol [13]3 years ago
4 0
3x+9 = 21+7x\\&#10;4x=-12\\&#10;x=-3
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Solve the equation x2 + x = 12.
Otrada [13]

please give brainliest

Let's solve your equation step-by-step.

x2+x=12

Step 1: Subtract 12 from both sides.

x2+x−12=12−12

x2+x−12=0

Step 2: Factor left side of equation.

(x−3)(x+4)=0

Step 3: Set factors equal to 0.

x−3=0 or x+4=0

x=3 or x=−4

Answer:

x=3 or x=−4

3 0
2 years ago
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What is 4 + 7 x 2 – 8
Inessa [10]

Answer:

The answer is 10.

Step-by-step explanation:

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Hope this helps! :)

8 0
2 years ago
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andre [41]
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4 0
3 years ago
Please explain each step 5x-7=7x-17
EleoNora [17]
Let's get the same terms on the same side.
I am going to remove 5x from both sides of the equation by subtracting 5x

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           -7 = 2x - 17   now lets remove the 17 from both sides
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<u>10</u><span>  = </span><u>2x</u><u>
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