SOLUTION: The sm of a number and twic its square is 35. Find the number

Question 1083159: The sm of a number and twic its square is 35. Find the number
Answer by ikleyn(52778) (Show Source): You can put this solution on YOUR website!
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The sum of a number and twice its square is 35. Find the number
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x + 2x^2 = 35,

2x^2 + x - 35 = 0.

Solve this quadratic equation using the quadratic formula.

On quadratic formula, see the lessons
    - Introduction into Quadratic Equations
    - PROOF of quadratic formula by completing the square

Also, you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this textbook under the topic "Quadratic equations".

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