Question

x ao quadrado + x-7=5

Answer 1

${x}^{2} + x - 7 = 5 \\ {x}^{2} + x - 12 = 0 \\ - 1 \sqrt{ - {1}^{2} - 4 \times 1 \times ( - 12) } \div 2 \times 1 \\ - 1 \sqrt{49} \div 2 \\ - 1 + 7 \div 2 = 3 \\ \\ - 1 - 7 = - 4$
x1 =3
x2=-4