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Solution of an Equation using Trial and Error Method

Question

$$x = -1$$ is a solution of the equation

A

$$2(x - 2) + 6 =0$$

B

$$x - 5 =6$$

C

$$2x + 5 = 7$$

D

$$3x + 5 =4$$

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Solution

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Correct option is C. $$2(x - 2) + 6 =0$$
$$x = -1$$
$$2(x-2) + 6 =0$$
$$\implies\, 2(-1 -2) + 6 =0$$
$$\implies\, 2 \times (-3) + 6= 0$$
$$\implies\, -6 + 6 =0$$

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