if you could help me you can get brainliest first

Step-by-step explanation:
area of rectangle= l×b
(7x-3)×(4x+1)
=4x(7x-3)+1(7x-3)
=28x²-12x+7x-3
=28x²-5x-3
I helped you and it takes too much time to solve it
please if it's right then plz make me brainliest