Question

Qual o resultado x² + 8x - 9 = 0 ​

Answer 1

Resposta:

x² + 8x - 9 = 0x = 16 - 17x = 11

Answer 2

Resposta:

Δ=b^2-4ac

Δ=8^2-4•1•(-9)

Δ=64+36

Δ=100

x=-b±√Δ/2a

x=-8±√100/2•1

x=-8±10/2

x'=-8+10/2

x'=2/2

x'=1

x''=-8-10/2

x''=-18/2

x''=-9