Final Answer
$x=3,\:x=-5$
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Step-by-step Solution
Problem to solve:
$x^2+2x=15$
Specify the solving method
1
Rewrite the equation
$x^2+2x-15=0$
Learn how to solve quadratic equations problems step by step online.
$x^2+2x-15=0$
Learn how to solve quadratic equations problems step by step online. Solve the quadratic equation x^2+2x=15. Rewrite the equation. To find the roots of a polynomial of the form ax^2+bx+c we use the quadratic formula, where in this case a=1, b=2 and c=-15. Then substitute the values of the coefficients of the equation in the quadratic formula:<ul><li>\displaystyle x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}</li></ul>. To obtain the two solutions, divide the equation in two equations, one when \pm is positive (+), and another when \pm is negative (-). Subtract the values 8 and -2.
Final Answer
$x=3,\:x=-5$