Question

Quanto é x.(x+5)-2x=28

Answer 1

x.(x+5)-2x=28
x²+5x-2x=28
x²+3x=28
x²+3x-28=0

a=1
b=3
c=-28

Bhaskara
∆=b²-4.a.c
∆=3²-4.1.(-28)
∆=9+112
∆=121

x=-b+-✓∆/2.a
x¹=-3+✓121/2.1
x¹=-3+11/2
x¹=8/2
x¹=4

x²=-3-11/2
x²=-14/2
x²=-7

disponha