Question

Q14. Find the area of a rectangle whose length is (3x² + 4x – 5) units and breadth
is (x2 – 4) units​

Answer 1

Area of rectangle = Length*Breadth

=(3x²+4x-5)(x²-4)

=x²(3x²+4x-5)-4(3x²+4x-5)

=3x⁴+4x³-5x²-12x²-16x+20

=3x⁴+4x³-17x²-16x+20

Answer 2

Answer:

given ,

lenght of rectangle = (3x²+4x-5)

breadth of rectangle = (x²-4)

so, area of rectangle = l×b

= (3x²+4x-5) (x²-4)

= x²(3x²+4x-5) -4(3x²+4x-5)

= 3x⁴+4x³-5x²-12x²-16x+20

= 3x⁴+4x³-17x²-16x+20