Question

Resolva as equação, Sendo U = R

-x²+3x+10=0

Answer 1

Explicação passo-a-passo:

-x² +3x + 10 =0

a=-1

b=3

c=10

Δ=b²-4ac

Δ=3²-4(-1)(10)

Δ=9+40

Δ=49

$x={-b\pm\sqrt{\Delta} \over2a}={-3\pm\sqrt{49} \over2(-1)}={-3\pm7\over-2}\\ \\ x'={-3-7\over-2}={-10\over-2}=+5\\ \\ x"={-3+7\over-2}={+4\over-2}=-2\\ \\ S=\{-2,+5\}$