What are the solutions of - x2 + 4x = x - 4?

Question

Matteo Jenkins

Mathematics

1 December, 19:41

What are the solutions of - x2 + 4x = x - 4?

+2

Answers (2)

Know the Answer?

Layla Franco · Answer 1

I think the answer is x = - 1 or x = 4

Cali Page · Answer 2

Hello,

-x²+4x=x-4;

-x²+4x-x+4=0

-x²+3x+4=0

x²-3x-4=0

∆=b²-4ac = (3) ²-4 (-4) (1) = 9+16=25

x₁,₂=-b±√∆/2a=3±5/2

x₁=3-5/2=-2/2=-1

x₂=3+5/2=8/2=4

Therefore the solutions are

x=-1 and x=4

bye : - )