Question

x(x-5)-2x igual 28 tirem o delt​

Answer 1

Resposta:

Δ=161

Explicação passo-a-passo:

x(x-5)-2x = 28

x²-5x-2x=28

x²-7x-28=0

$Aplicando~a~f\'{o}rmula~de~Bhaskara~para~x^{2}-7x-28=0~~\\e~comparando~com~(a)x^{2}+(b)x+(c)=0,~temos~a=1{;}~b=-7~e~c=-28\\\\\Delta=(b)^{2}-4(a)(c)=(-7)^{2}-4(1)(-28)=49-(-112)=161$