Math and Arithmetic
Algebra
Calculus

# How do you solve 2x squared plus x plus 2 equals 0 by completing the square?

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It cannot be solved because the discriminant of the quadratic equation is less than zero

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## Related Questions

If x squared -10 = 0 then x = the square root of 10

This question cannot be answered. You will have to give me the number to the square root. * * * * * a = &plusmn;sqrt(c^2 - b^2)

Yes and x = 2+square root of 6 or x = 2-square root of 6

If r-squared = theta then r = &Acirc;&plusmn;sqrt(theta)

This quadratic equation has no solutions because the discriminant is less than zero.

I couldn't answer the question because the question is not proper to slove. I just want you to follow the related link that explains how to solve the equation by completing the square.

x2=-81take the square root of both sidessince 81 is negative you need to take 81 times i when i=-1 then solve as the square root of 81. your answer is x=9i

Completing the square is a method used to solve a quadratic function. This is a handy method when there are two instances of the same variable in the function.

Please do not remove this question from Inappropriate or split any alts from it. Thanks!

The related link "Purple Math" has an in depth explanation.

Divide all terms by 3 so:- x2-4x = 5 Completing the square:- (x-2)2 = 9 x-2 = -/+3 x = -1 or x = 5

x^2 = 64 x = +,- square root of 64 = +,- 8. Thus, x = -8 or x = 8

If you aren't dealing with algebra, such as x2+3x+21, then completing the square wont be able to solve the porblem, however if you are using algebra, and you cannot factorise, then completing the square will always work

So u have the function x2-4=0 Now because 4 is a squared number, its square root is 2 (x+2)(x-2)=0

Expression: x^2 -x -12 Completing the square: (x -0.5)^2 -12.25

Yes, this is a perfectly legitimate thing to do in the trigonometric functions. I will solve all your math problems. Check my profile for more info.

Completing the square is a method to solve quadratic equations. To use this method you take the number without a variable and subtract it from both sides, so that it is on the opposite side of the equation. Then add the square of half the coefficient of the x-term to both sides. This will give you a perfect square equation to solve for.

the problem is not proper to slove. I just want to suggest to follow the related link that explains the concept of completing the square clearly.

Do sin(x), square it, and then multiply it by two.

###### Math and ArithmeticAlgebra

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