Question

A number multiplied by itself added to itself equals 30. What are the two possible numbers?

Answer 1

The only possible number I know is: 5
Explanation: 5 multiplied by its-self is 25. Then if its added by itself which means 25 + 5 = 30. (I'll show you the whole thing.) 5x5=25 25+5=30.
I've thought for a while, and the only number I've found was 5. But I hope someone else can find the other number or maybe even you. :)

Answer 2

The number . . . x

Multiplied by itself . . . x²

Multiplied by itself, then added to itself . . . x² + x

You said it's equal to 30, so x² + x = 30 .

Subtract 30 from each side: x² + x - 30 = 0 .

There you have a perfectly nice quadratic equation.
To solve it, you can either factor the left side, or use the quadratic equation.
Either way, the two solutions are

x = 5
and
x = -6 .