Question

The sum of a whole number and twice the square of number is 10 . Find the Number

Answer 1

Answer:

2

Step-by-step explanation:

2+(2)^2 into 2 = 10

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Answer 2

Answer:

Let the number be x.

Therefore,x + 2x² = 10

2x² + x - 10 = 0

Factorising the quadratic equation we get,

2x² + 5x - 4x - 10 = 0

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

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

x = 2, -5/2

Since x is a whole number.

Therefore,-5 / 2 wont be applicable.

Therefore,x = 2.

Hence,the number is 2.