Question

Помогите сделать быстро.

Answer 1

Объяснение:

№1.

$x^2+px-35=0\ \ \ \ x_1=7 \ \ \ \ x_2=?\ \ \ \ p=?\\\left \{ {{-(x_1+x_2)=p} \atop {x_1*x_2=-35}} \right.\ \ \ \ \left \{ {{-7-x_2=p} \atop {7*x_2=-35\ |:7}} \right. \ \ \ \ \left \{ {{p=-7-(-5)} \atop {x_2=-5}} \right. \ \ \ \ \left \{ {{p=-2} \atop {x_2=-5}} \right. .$

№2.

$x^2-13x+q=0\ \ \ \ x_1=12,5\ \ \ \ x_2=?\ \ \ \ q=?\\\left \{ {{-(x_1+x_2)=-13\ |*(-1)} \atop {x_1*x_2=q}} \right. \ \ \ \ \left \{ {{12,5+x_2=13} \atop {12,5*x_2=q}} \right. \ \ \ \ \left \{ {{x_2=0,5} \atop {q=12,5*0,5=6,25}} \right..$