Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions


X     =   Let be the length
x-4  =  width

A    =   LW
A     =  x(x-4)
 81   =   x^{2} -4x
Apply Subtraction Property of Equality. Subtract 81 to both sides.
0     =  x^{2} -4x-81
The equation is  x^{2} -4x-81=0, which is a quadratic equation.
1 3 1
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts