Question 73594
(1/2x-10)(1/2x+10)
1/2x*1/2x=1/4x^2
1/2x*10=5x
1/2x*-10=-5x
-10*10=-100 now combine all these terms & we get
(1/4x^2-100) bwcause the 5x & the -5x cancel out.