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3x^2-4=8 ....... Solve the following equation by taking square roots! PLZ SHOW WORK ASAP TY!

User Dejavu
by
8.3k points

2 Answers

6 votes

Answer:


x=\± 2

Explanation:


3x^2-4=8


3x^2-4+4=8+4


3x^2=12


\displaystyle (3x^2)/(3)=(12)/(3)


x^2=4


x=\± √(4)


x=\± 2

User James Crowley
by
9.0k points
2 votes

Answer:

x = ±2

Explanation:

3x^2-4=8

Add 4 to each side

3x^2-4+4=8+4

3x^2 = 12

Divide by 3

3x^2 /3 = 12/3

x^2 = 4

Take the square root of each side

sqrt(x^2) = ±sqrt(4)

x = ±2

User Randerson
by
8.5k points

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