Question

помагите
31х+77=15(х+1)^2

Answer 1

31х+77=15(х+1)^2
31х+77=15(х^2+2x+1)
31x+77=15x^2+30x+15
31x+77-15x^2-30x-15=0
-15x^2+x+62=0
D=1^2-4*(-15)*62=1+3720=3721
$x_{1} = frac{-1+ sqrt{3721} }{2*(-15)} = frac{-1+61}{-30} =-2$
$x_{2} = frac{-1- sqrt{3721} }{2*(-15)} = frac{-1-61}{-30} =2,07$