Question

qual o conjunto solução da equação (x + 3). (x + 5) = 35?​

Answer 1

(x+3)(x+5)=35

x²+5x+3x+15=35

x²+8x+15-35=0

x²+8x-20=0

Δ=b²-4ac

Δ=8²-4.1.(-20)

Δ=64+80

Δ=144

x=-b+-✓Δ/2a

x=-8+-12/2

x'=-8+12/2=4/2=2

x"=-8-12/2=-20/2=-10

s={2, -10}