Question

If a= 2x-3 and b= 2x+5

determine the product of a and b by using formulae. if x=2, ab= what?
help pleasee would appreciate a lot

Answer 1

a= 2x-3 b= 2x+5

ab= (2x-3)(2x+5)

= 2x*2x+ 2x*5- 3*2x- 3*5

= 4x+ 10x- 6x- 15

= 14x- 6x- 15

= 8x -15

x= 2

= 8(2)- 15

= 16-15

= 1