Question

(2) - квадрат

X(2)+3x=40

4x(2)+28x+49=0

9x(2)+6=21x

3x(2)-8+10x=0

14+5x(2)-10x=0

5x-x(2)=0

169-b(2)=0

Answer 1

х(2)+3х=40
х(2)+3х-40=0
(х+8)(х-5)=0
х=-8 х=5