Question

2. A number added to twice its square, then
the result is 21. A quadratic equation of this
situation is
(1 Point)
x2 + x - 21 = 0
x2 - x + 21 = 0
O x2 + x + 21 = 0
x2 - x - 21 = 0​

Answer 1

Answer:

Let number be x.

x + x^2 = 21

x^2 + x - 21 = 0

Answer 2

Option 1 is the answer a number is x and it is square is added to get 21
When we bring 21 to lhs we get option 1 as the right answer