Question

Resolva as equações:

a) x² - 8x - 2 = 0

b) 6x² + 3x + 1 = 0

c) x² - 2x - 15 = 0

Answer 1

A)
${x}^{2} - 8x = 2 \\ {x}^{2} = 2 \div 8 \\ {x}^{2} = 4 \\ x = \sqrt{4} \\ x = 2$
B)
${6x}^{2} + 3x = - 1 \\ {x}^{2} = 9 \div 1 \\ {x}^{2} = 9 \\ x = \sqrt{9 } \\ x = 3$
C)
${x}^{2} - 2x = 15 \\ {x}^{2} - x = 15.2 = 30 \\ x = 30$