Question

4x elevado a 2 -28x+13=0

Answer 1

Explicação passo-a-passo:

4x² -28x + 13=0

coeficientes

a=4

b=-28

c=13

Δ=b² -4ac

Δ=(-28)²-4(4)(13)

Δ=784-208

Δ = 576

$x={-b\pm\sqrt{\Delta} \over2a}={-(-28)\pm\sqrt{576} \over2(4)}={28\pm24\over8}\\ \\ x'={28+24\over8}={52\over8}={13\over2}\\ \\ x"={28-24\over8}={4\over8}={1\over2}\\ \\ S=\{{1\over2},{13\over2}\}$