Answer:
Step-by-step explanation:
497 = 500 - 3
505 = 500+ 5
(x + a) (x + b) = x² + (a + b) x + ab
x = 500; a = -3 ; b= +5
(500 - 3) ( 500 + 5) = (500)² + (-3 +5)500 + (-3)*5
= 250000+ (2)*500 + (-15)
=250000 + 1000 -15
= 250985
