Question

Q3. The sum of a whole number and twice its square is 36. Find the number.​

Answer 1

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x + 2x^2 = 36

2x^2 + x - 36 = 0

(2x + 9)(x - 4 ) = 0

2x+9 results in negative measures

x - 4 = 0  --> x = 4

4 + 2(4^2) = 4 + 2(16) = 4 +32  = 36

Answer 2

Step-by-step explanation:

let the whole number be x.

According to question,

x + 2x^2=36

(x-4) (2x+9)=0

x = 4 or -9/2

Since a whole number cannot be negative,

therefore, the number is 4.