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My name is Ann [436]
2 years ago
12

Dimitri is solving the equation x2 – 10x = 21. Which value must be added to both sides of the equation to make the left side a p

erfect-square trinomial?
0
4
25
100
Mathematics
2 answers:
vitfil [10]2 years ago
8 0

Answer:

C. 25

Step-by-step explanation:

Edge 2020

balandron [24]2 years ago
4 0

Answer:

the answer is C 25

Step-by-step explanation:

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Solve to find X. 1/5(x - 2) = 1/10 (x + 6)
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Answer:

x = 10

Step-by-step explanation:

First, distribute:

\frac{1}{5} x - \frac{2}{5} =\frac{1}{10} x+\frac{6}{10}

Next, subtract \frac{1}{5}x from both sides:

-\frac{2}{5} = \frac{1}{10} x -\frac{1}{5} x+\frac{6}{10}

(multiply \frac{1}{5}x by 2 to get common denominator, \frac{2}{10} x )

-\frac{2}{5} =-\frac{1}{10}x +\frac{6}{10}

Next, subtract \frac{6}{10} from both sides:

-\frac{2}{5} -\frac{6}{10} =-\frac{1}{10} x

(multiply \frac{2}{5} by 2 to get common denominator, \frac{4}{10} )

-\frac{10}{10} =-\frac{1}{10} x ⇒ -1=-\frac{1}{10} x

Next, multiply both sides by 10:

-10=-x

FInally, divide both sides by -1:

x = 10

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