Question

when the square of a number is added to the number we get 30 .what are the numbers?

Answer 1

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Answer 2

Hello there,

If x is the number, we have

x2 + x = 30

and

x2 + x - 30 = 0

We can factor this quadratic

(x+6)(x-5) = 0

x = 5, -6

We need to check these solutions

for x=5

52 + 5 = 25 + 5 = 30

(-6)2 + (-6) = 36 - 6 = 30