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Julli [10]
3 years ago
13

Complete the square for 3x^2-6x=21. leave your answer in the form (____)^2=(____)

Mathematics
2 answers:
jarptica [38.1K]3 years ago
6 0
X^2-2x=7
x^2-2x+1=7+1
(x-1) ^2=8
Mrac [35]3 years ago
3 0

Answer: (x - 1)² = 8

<u>Step-by-step explanation:</u>

3x² - 6x = 21

<u>÷3 </u>  <u> ÷3 </u>  <u> ÷3 </u>

 x² - 2x = 7

x² - 2x + ___ = 7 + ___

     ↓         ↑              ↑

   \frac{-2}{2} = (-1)^{2}

x² - 2x + <u> 1 </u> = 7 + <u> 1 </u>

    (x - 1)²     =  8

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