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Solve for x 2/3( x-7)=-2

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Solve , x^2 / 3(x -7) = -2

First, do the distributive:

3(x -7) = 3 . X + 3 . -7

3(x -7) = 3x - 21

Then,

x^2 / 3(x -7) = -2

x^2 / (3x - 21) = -2

Now, pass the term (3x - 21) to the right side of equation.

x^2 = (3x - 21) . - 2

Use the distributive again

x^2 = 3x .(- 2) -21 . -2

x^2 = -6x + 42

Pass the terms -6x + 42 to the left side of equation. But, changing the sinal

x^2 + 6x - 42 = 0

We have a equation of bhaskara

Where,

a = 1
b = 6
c = -42

Delta = b^2 - 4 . ac

Delta = 6^2 - 4.1.(-42)

Delta = 36 + 168

Delta = 204

Then,

x = [ - b + / - √(Delta) ]/2a

x = [ -6 +/- √(204) ]/2(1)

x = [ -6 +/- √(4×51) ]/2

x = [ - 6 +/- 2√(51) ]/2

Then, we will have two answer

x = [ - 6 - 2√(51)]/2

x = -3 - √(51)

Or

x = [ - 6 + 2√(51) ]/2

x = -3 + √(51)
User Rick Suggs
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