Question

$(k + 3 {)}^{2} - (t - 1 {)}^{2}$

Answer 1

(k+3)²-(t-1)²=

(k+3-(t-1))×(k+3+(t-1))=

(k+3-t+1)×(k+3+t-1)=

(k+4-t)×(k+2+t)