Question

if a= 8+-0.2 and b=2+-0.1 then a-3b =?

Answer 1

Answer:

2.1 is correct

Your answer is attached in the picture

Answer 2

a - 3b = 2.1

GIVEN:-

a = 8+ (-0.2)

b = 2+ (-0.1)

TO FIND:- a - 3b

SOLUTION:-

• Plus sign + minus sign = minus

$a = 8 + ( - 0.2) \\ = 8 - 0.2 \\ = 7.8$

$b = 2 + ( - 0.1) \\ = 2 - 0.1 \\ = 1.9$

According to the question we need to find the value of

a - 3b

BY SUBSTITUTING THE VALUES WHERE a = 7.8 and b = 1.9

$a - 3b \\ = 7.8 - (3 \times 1.9) \\ = 7.8 - 5.7 \\ = 2.1$

Hence, a - 3b = 2.1

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