Solve and explain please

j= -9, -2

Step-by-step explanation:

(j+9)(j+2)

j=-9, -2

m∠a is 90°

m∠b is 40°

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft