Question

-8x²-32x=0
15x²=-25x

Answer 1

a=-8   b=-32   c=0   x1=32+32/-16=64/-16=-4

Δ=(-32)²-4.(-8).0      x2=32-32/-16=0/-16=0  s(-4,0)
Δ=1024+0
Δ=1024
b)15x²+25x=0   x1=-25+25/30=0/30= 0
Δ=25²-4.15.0    x2=- 25-25/30=-50/30=-5/3
Δ=625-0
Δ=625