Question

r^2+13r-30 is 2or-15 it is correct

Answer 1

Step-by-step explanation:

${r}^{2} + 13r - 30 = 0 \\ by \: factorization \\ {r}^{2} + 15r - 2r - 30 = 0 \\ r(r + 15) - 2(r + 15) = 0 \\ (r - 2)(r + 15) = 0 \\ r = 2 \: \: \: \: or \: \: \: r = - 15$