Final Answer
$r=-4,\:r=3$
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Step-by-step Solution
Problem to solve:
$12-r-r^2=0$
Specify the solving method
1
Sort the polynomial $12-r-r^2$ in descending order to handle it more easily
$-r^2-r+12=0$
Learn how to solve quadratic equations problems step by step online.
$-r^2-r+12=0$
Learn how to solve quadratic equations problems step by step online. Solve the quadratic equation 12-r-r^2=0. Sort the polynomial 12-r-r^2 in descending order to handle it more easily. Factor the trinomial by -1 for an easier handling. Factor the trinomial -\left(r^2+r-12\right) finding two numbers that multiply to form -12 and added form 1. Thus.
Final Answer
$r=-4,\:r=3$