Question

verify :
$x \times x \times x - 1 = (x - 1) \times ( x \times x + x + 1)if \: x = 200$

​

Answer 1

$x * x * x - 1 = (x-1) * (x*x+x+1)$

$x = 200$

$200 * 200 * 200 - 1 = (200 - 1) * (200 *200+200+1)\\\\7999999 = 199 * 40201 \\\\7999999 = 7999999$

$hence , \ verified$

$hope \ it \ helps \ !!$