Question

Solve given equation by trial and error method: 3x + 15 = 24
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Answer 1

Answer:

3

Step-by-step explanation:

When x = 0,

3 ( 0 ) + 15 = 24

0 + 15 = 24

15 ≠ 24

Therefore, x ≠ 0

When x = 1,

3 ( 1 ) + 15 = 24

3 + 15 = 24

18 ≠ 24

Therefore, x ≠ 1

When x = 2

3 ( 2 ) + 15 = 24

6 + 15 = 24

21 ≠ 24

Therefore, x ≠ 2

When x = 3,

3 ( 3 ) + 15 = 24

9 + 15 = 24

24 = 24

Therefore, x = 3

Answer 2

Step-by-step explanation:

when x = 1,

$\implies$ $\sf{ 3x+15 = 24}$

$\implies$ $\sf{3(1)+15 = 24 }$

$\implies$ $\sf{ 18 \neq 24}$

$\therefore$ $\sf{x \neq 1 }$

when x = 2,

$\implies$ $\sf{ 3x+15 = 24}$

$\implies$ $\sf{3(2)+15 = 24 }$

$\implies$ $\sf{6+15=24 }$

$\implies$ $\sf{ 21 \neq 24}$

$\therefore$ $\sf{x \neq 2 }$

when x = 3,

$\implies$ $\sf{ 3x+15 = 24}$

$\implies$ $\sf{3(3)+15 = 24 }$

$\implies$ $\sf{9 + 15 = 24 }$

$\implies$ $\sf{ 24 = 24}$

$\therefore$ $\boxed{\sf{ x=3 }}$

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