Question

$( \times + 3).( \times - 6) = - 18$

Answer 1

(x+3).(x-6)=-18

x^2-6x+3x-18=-18

x^2-3x-18+18=0

x^2-3x=0

x.(x-3)=0

x=0 ou x-3=0 x=3

s={0,3}



espero ter ajudado!

bom dia !

Answer 2

$(x + 3) \times (x - 6) = - 18$

${x}^{2} - 6x + 3x - 18 = - 18$

${x}^{2} - 6x + 3x = 0$

${x}^{2} - 3x = 0$

$x = \frac{ - ( - 3) + - \sqrt{ {( - 3)}^{2} - 4 \times 1 \times 0 } }{2 \times 1}$

$x = \frac{3 + - \sqrt{ {( - 3)}^{2} - 0 } }{2}$

$x = \frac{3 + - \sqrt{ {( - 3)}^{2} } }{2}$

$x = \frac{3 + - 3}{2}$

$x = \frac{3 +3 }{2} \\ x = \frac{3 - 3}{2}$

$x = 3 \\ x = 0$