Question

Rezolvati ecuatiile

c) x/15 = 5/3x

d) (x-1)² = 16

e) (2x +-3)² = 81​

Answer 1

c) x/15=5/3x
3x*x=15*5
3x^2=75
x^2=25
x=+-5
d) (x-1)^2=16
x-1€{-4,4}
x€{-3,5}
e) (2x-3)^2=81
2x-3€{-9,9}
2x€{-6,12}
x€{-3,6}