Question

(5x - 2).(2x-1)=
n entendi ​

Answer 1

Resposta:

10x

2

−9x+2

Explicação passo-a-passo:

\begin{gathered}\left(5x-2\right)\left(2x-1\right)\\\\=5x\cdot \:2x+5x\left(-1\right)+\left(-2\right)\cdot \:2x+\left(-2\right)\left(-1\right)\\\\=5\cdot \:2xx-5\cdot \:1\cdot \:x-2\cdot \:2x+2\cdot \:1\\\\=10x^2-9x+2\\\end{gathered}

(5x−2)(2x−1)

=5x⋅2x+5x(−1)+(−2)⋅2x+(−2)(−1)

=5⋅2xx−5⋅1⋅x−2⋅2x+2⋅1

=10x

2

−9x+2

Answer 2

Resposta:

(5x-2)(2x-1)

10x²-5x-4x+2

10x²-9x+2=0

∆ =(-9)²—4*10*2

∆ = 81-80

∆ = 1

x1=(9+1)/2*10

x1=10/20=1/2

x2 =(9-1)/2*10

X2 =8/20

x2 = 2/5