Question

Escreva as seguintes questoes de forma reduzida :
a) (3x-4) .(3x+1) =14-9x
b) (x+5).(x-4)=x+16

Answer 1

A)
$9x - 4 = 14 - 9x \\ 9x + 9x = 14 + 4 \\ 18x = 18 \\ x = 18 \div 18 \\ x = 1$
B)
${x}^{2} + 20 = x + 16 \\ {x}^{2} - x = 16 - 20 \\ {x}^{2} - x = 4 \\ x = \sqrt{4 } \\ x = 2$