X^2+3x=54 ?x^2+11x=54 ? x^2=-4+32 ?

Question

X^2+3x=54 ?x^2+11x=54 ? x^2=-4+32 ?

Answer 1

1) x²+3x=54; x²+3x-54=0; x1=-9; x2=6
2) x²+11x=54; x²+11x-54=0; D=b²-4ac=121+216=337; x=(-11+-√337)/2
3) x²=-4+32; x²=28; x=+-√28; x=+-2√7