Subject
MBA Exam
Topic
MBM Admission Test 2003-04(8th Batch)
If (x-1)2= 400, which of the following could be the value of x-5?
If (x-1)2= 400, which of the following could be the value of x-5?
ক)
15খ)
14গ)
-24ঘ)
-25Explanation
here, (x - 1)2 = 400 √(x - 1)^2 = √400 This gives us: |x – 1| = 20 Because there is an expression inside the absolute value sign, we must consider that the entire expression, and not just the variable, can be either positive or negative. We’ll need to solve the equation twice. Solve for x-1 as positive: |x – 1| = 20 x – 1 = 20 x = 21 Solve for x-1 as negative: |x – 1| = 20 or,-(x – 1) = 20 or,-x + 1 = 20 or,-x =19 or,x = -19 Thus, x – 5 can equal either 21 – 5 = 16 or -19 – 5 = -24.Related questions
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