Question

1.(X-1)(x+1)= х^2-2(х-3)
2.(3х+4)(3х-4)-(3х+5)^2= -11

Answer 1

1) (х-1)(х+1)=х²-2(х-3)

х²-1=х²-2х+6

х²-х²+2х=6+1

2х=7

х=3,5

2) (3х+4)(3х-4)-(3х+5)²=-11

9х²-16-(9х²+30х+25)=-11

9х²-16-9х²-30х-25=-11

-30х=-11+16+25

-30х=30

х=-1