Question

Find the missing side of the rectangle if the perimeter ?

Answer 1

length = 12x^2-30x

two width

=(30x^2-78x+12)-2(12x^2-30x)

=(30x^2-78x+12)-24x^2+30x

=6x^2-48x+12

one width

=(6x^2-48x+12)÷2

=3x^2-24x+6