Question

The sum of a whole number and twice the square of the number is 10. find the number ​

Answer 1

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Answer 2

The number is 2.

Explanation:

If the number is x then:

x + 2x^2 = 10

2x^2 + x - 10 = 0

2x^2 - 4x + 5x - 10 = 0

2x(x - 2) + 5(x - 2) = 0

(2x + 5)(x - 2) = 0

x = 2.