Question

the areof a rectangle is(x^2-4x-21) sq units. what are its dimensions?​

Answer 1

Answer:

x^2-4x-21

=x^2-7x+3x-21

=x(x-7)+3(x-7)

=(x-7)(x+3)

so length of the rectangle is (x+3) unit and breadth of the rectangle is ( x-7) unit