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X2 plus x equals 3x-5

Updated: 10/17/2024
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Wiki User

14y ago

Best Answer

x2 +x=3x-5

so x2 -2x+5=0

which does not factor ( over the real numbers) so you can either complete the square of use the quadratic equation to solve.

Let's complete the square.

(x-1)2 =-4

x-1= plus of minus 2i

so x=1+2i or x=1-2i

Now check it just as you would a real answer.

1+2i -1 is 2i

and 2i squared is -4 as desired

Now 1-2i-1 is -2i and (-2i) squared is -4 also.

We know the answer is not real if we simply calculated the discriminant.

b2 -4ac=4-4(5)<0 so there are no real answers as we found.

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Wiki User

14y ago

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