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

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Question 1083159: The sm of a number and twic its square is 35. Find the number
Answer by ikleyn(52777) About Me  (Show Source):
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The highlight%28cross%28sm%29%29 sum of a number and highlight%28cross%28twic%29%29 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".