Question

The square of a number plus the number is 12. What is the number?

Answer 1

HEY MATE HERE IS YOUR ANSWER

let the number be x

$x {}^{2} + x = 12 \\ x {}^{2} + x - 12 = 0 \\ x {}^{2} + 4x - 3x - 12 = 0 \\ x(x + 4) - 3(x + 4) \\ (x + 4)(x - 3) = 0 \\ x = 3 \: and \: - 4$

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Answer 2

HEY MATE HERE IS YOUR ANSWER--

let the number be x

x²+x=12

x² +x−12=0

x²+4x−3x−12=0

x(x+4)−3(x+4)

(x+4)(x−3)=0

x=3and−4