algebra
posted by Lucas on .
4r^2+21r=r+13
3s^226s+2=5s^2+1
Please, please could you be so nice and help me with step by step, I can't find right solution, Thank you so much!!!!

always set everything equal to zero. That way if you find factors, you knwo that each factor that is zero will provide a root.
4r^2 + 20r  13 = 0
use the quadratic formula to get
r = 5/2 ± √3
2s^2  26s + 1 = 0
s = 1/2 (13 ± 3√19)