Respuesta :

Answer:

Step-by-step explanation:

Height or Length of rectangle= 4x

Breadth of rectangle= 3x+1

Now, we know that

Area of rectangle= Length×Breadth

= 4x(3x+1)

=

Hence, Area of given rectangle can be expressed as .

This is the best possible answer

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Answer:

A=12x²+4x

Step-by-step explanation:

Area of Rectangle Formula

A=l*w

A=(3x+1)(4x)

A=12x²+4x