Question

O conjunto solução das equações do 2º grau: a)x2 -15x =0, b) b) 9x2 -16 =0, c) x2 +4x-5=0 d) x2 +8x+16=0 É respectivamente​

Answer 1

Resposta:

Oie!!!

Explicação passo-a-passo:

Vamos lá!

$\boxed{x^{2} -15x=0}\\\\x'+x''=-\dfrac{b}{a}=15\\\\x'\centerdot x''=\dfrac{c}{a}=0\\\\ S=\{15;\ 0\}\\\\\\\boxed{9x^{2} -16=0}\\\\9x^2=16\\\\x=\sqrt{16/9}\\\\x=4/3 \\\\S=\{4/3;\ 0\}\\\\\\\boxed{x^{2} +4x-5=0}\\\\x'+x''=-\dfrac{b}{a}=-4\\\\x'\centerdot x''=\dfrac{c}{a}=-5\\\\ S=\{-5;\ 1\}\\\\\\\boxed{x^{2} +8x+16=0}\\\\x'+x''=-\dfrac{b}{a}=-8\\\\x'\centerdot x''=\dfrac{c}{a}=16\\\\ S=\{-4\}$