Question

Sabendo que y = x² + 7x - 18 , determine as raízes da equação

Answer 1

Resposta: x1=2 e x2=-9

Explicação passo-a-passo:

y = x² + 7x - 18

Answer 2

Resposta:

x'=2  e x''=-9

Explicação passo-a-passo:

$a=1, b=7 \, \,e\,\, c=-18\\\Delta =b^2-4ac=7^2-4\cdot 1 \cdot (-18)=49+72=121\\\\\\x=\frac{-b\pm\sqrt{\Delta}} {2a} \\\\x= \frac{-7\pm \sqrt{121} }{2\cdot 1}\\\\x=\frac{-7\pm 11}{2} \\\\x'=\frac{-7+11}{2}=4/2=2\\\\x''=\frac{-7-11}{2}=-18/2=-9$