Question

(x+5)²=9 me ajudem ai rapaziada trabalho pra escola

Answer 1

(x+5)²=9

x²+2.5.x+5²=9

x²+10x+25=9

x²+10x+25-9=0

x²+10x+16=0

Δ=b²-4ac

Δ=10²-4.1.16

Δ=100-64

Δ=36

x=(-b±✓Δ)/2a

x=(-10±6)/2

x'=(-10+6)/2=-4/2=-2

x"=(-10-6)/2=-16/2=-8

S={-2, -8}