The operationis defined for all integers a and b by the equation ab = (a - 1)(b - 1). If x15 = 98, what is the value of x ?	Choose the correct choice from the following answers.
A) 8 B) 7 C) 10 D) 11 E) 12
ab = (a - 1)(b - 1)   x15 = (x-1)(15-1) = 98 --&gt; x-1=7 --&gt; x=8   8nswer: 8.
<result>A</result>
The operationis defined for all integers a and b by the equation ab = (a - 1)(b - 1). If x15 = 98, what is the value of x ?