15 x x=990

Type your math problem... 15 x x=990

Question

Solve the quadratic equation

Solve using square roots

Solve using the quadratic formula

Solve using the PQ formula

x_{1} = - 66, x_{2} = 66

Alternative Form

x_{1} \approx - 8.124038, x_{2} \approx 8.124038

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