Question

Determine a solucao equacoe incompleta do 2 grau. a)X2-25=0 b)x2-8=0 c)x2-7=0.

Answer 1

Obs.:  "+-" indica "mais ou menos".

a)

x²-25 = 0

x² = 25

x = +- $\sqrt[]{25}$

x = +- 5

b)

x²-8 = 0

x² = 8

x = +-$\sqrt[]{8}$

x +- $\sqrt[]{2^2*2}$

x = +- 2$\sqrt[]{2}$

c)

x²-7 = 0

x² = 7

x = +-$\sqrt[]{7}$