If A - x - 5 x -4 - 14- x - W - then A -1-2 -A- FalseB- True

The correct option is A False Since, x ∈ W, x = 5x +4 ≤ 14 Substituing the values for x = 0, 1, 2.... If x = 0 ⇒ 5(0) + 4 = 4 If x = 1 ⇒ 5(1) + 4 = 9 If x = 2 ...

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Standard VII

Mathematics

Roster Method

If A = x : 5 ...

Question

If A = ${x : 5 x + 4 \leq 14, x \in W}, t h e n A = {1, 2} ?$

True

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False

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Solution

The correct option is B
False

Since, $x \in W, x = 5 x + 4 \leq 14$

Substituing the values for $x = 0, 1, 2....$

If $x = 0 \Rightarrow 5 (0) + 4 = 4$

If $x = 1 \Rightarrow 5 (1) + 4 = 9$

If $x = 2 \Rightarrow 5 (2) + 4 = 14$

Since, $x = 5 x + 4 \leq 14$ The maximum value for x is 2.

$A = {4, 9, 14}$

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If A = {x:5x+4≤14,x∈W}, then A={1,2}?

The correct option is B False Since, x∈W, x=5x+4≤14 Substituing the values for x=0,1,2.... If x=0⇒5(0)+4=4 If x=1⇒5(1)+4=9 If x=2⇒5(2)+4=14 Since, x=5x+4≤14 The maximum value for x is 2. A={4,9,14}

If A = ${x : 5 x + 4 \leq 14, x \in W}, t h e n A = {1, 2} ?$