Question

Por favor me ajude nessa conta. 5.(X 2) 2.(x-1)=15

Answer 1

(5X+10)× (2X-1)=15
10X²-5X+20X-10-15=0
10X²+15X-25=0
Δ=b²-4×a×c
Δ=15²-4×10×(-25)
Δ=225+1000
Δ=1225
x=-b +-√Δ/ 2×a
x=-15+-35/2×10
x=-15+-35/20
x'=-15-35/20 
x'=50/ 20
x'=2,5
x''=-15+35/20
x''=20/20
x''=1 
espero ter ajudado :)