Question

Solve the quadratic by taking square roots.  Write your answer with no spaces as x=a,-a where a and -a are the values you found when solving. 

3x² - 7 = 140
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Answer 1

x=7,−7

Explanation:

In order to find the value of x in this quadratic equation we first need to make the equation equal 0 by getting rid of the 140. We do this by subtracting 140 on each side.

3x² - 7 = 140

3x² - 147 = 0

Now we solve as a regular quadratic formula

x=
`x = \frac{-(0) +- \sqrt{0^(2) - 4(3)(-147) } }{2(3)}`

`x = (0 +- √(1764) )/(6)`

x=7,−7