Question

$(x-7)(x+3) + 4x = 30 EQUAÇÃO DO 2° GRAU INCOMPLETA$

Answer 1

x²+3x-7x-21+4x = 30
x²-21-30 = 0
x²-51 = 0
x² = 51
x = +/- \/51
S: {-\/51; +\/51}