question

Asked by arindeep.singh | 17th Sep, 2020, 11:19: AM

Expert Answer:

Given: Three points A(a, 1), B(1, -1) and C(11, 4) are collinear
Therefore, area of a triangle formed by these three points will be zero
 
1 half open square brackets straight a open parentheses negative 1 minus 4 close parentheses plus 1 open parentheses 4 minus 1 close parentheses plus 11 open parentheses 1 plus 1 close parentheses close square brackets equals 0
minus 5 straight a plus 3 plus 22 equals 0
5 straight a equals 25
straight a equals 5

Answered by Renu Varma | 17th Sep, 2020, 01:49: PM