A multiplication is zero if and only if at least one of the factors is zero. So, in this case, the multipications equals zero when
The first equation has no real solutions, because is a square, and thus it's positive. If you add 4 to a positive number, the result can't be zero.
The second equation has the solution
So, globally, the expression equals zero if and only if
Answer:
Building depth = 168 ft
Step-by-step explanation:
we must find the relationship (scale) of the model with respect to the building .
wide-m (model) = 3 in
deep-m(model) = 4 in
wide-b (building) = 126 feet
deep-b(building) = x
the measures must be standardized
let's convert feet to inches
12 in → 1 feet
3 in → ?, then
3 in → 0.25 feet and 4 in → 1/3 feet
now deep-m = x