Question

(5+m)в 2степени +(m+2)(m-2)-2m(+5)

Answer 1

${(5 + m)}^{2} + (m + 2)(m - 2) - 2m( + 5) = 25 + 10m + {m}^{2} + {m}^{2} - 4 - 10m = 2 {m}^{2} + 21$