Question

31х+17=15(х+1)в квадрате
помогите плиз...

Answer 1

31x+17=15(x+1)²
31x+17=15(x²+2x+1)
31x+17=15x²+30x+15
-15x²+31x-30x+17-15=0
-15x²+x+2=0
15x²-x-2=0
D=1+120=121
x₁=(1-11)/30=-1/3
x₂=(1+11)/30=12/30=2/5