Answer:
2x²-7x
Step-by-step explanation:
7x²-5x²=2x²
10x-3x=7x
Let
x---------> the length of the rectangle
y--------> the width of the rectangle
we know that
A=84 ft²
[area of rectangle]=x*y-----> 84=x*y-----> equation 1
x=y-5------> equation 2
substitute 2 in 1
84=[y-5]*y-----> 84=y²-5y---------> y²-5y-84=0
using a graph tool-----> to resolve the second order equation
see the attached figure
the solution is
y=12
x=y-5-----> x=12-5-----> x=7
the answer isthe length of the rectangle is 7 ftthe width of the rectangle is 12 ft
I think its 4 because the lines intersect 4 times but its been too long since ive done nonlinear equations
The answer is b=88
Hope this helped!
I think you count the squares in the middle or radius ?