Question

HELP плис помогите решить

Answer 1

1)x^2-49=0

X^2=49

√x^2=√49

|x|=7

X¹=7 x²=-7

2)16x^2+25=0

X^2=-25/16

√X^2=√-25/16

|x|=5/4

X1=5/4 x2=-5/4

(3x-5)^2-16=0

9x^2-30x+25-16=0

9x^2-30x+9=0|:3

3x^2-10x+3=0

D=b^2-4ac=100-36=64

X1=-b+√d/2a=10+8/6=3

X2=10-8/6=1/3