Q. Solve the equation for all values of x.∣x+1∣+7=2xAnswer: x=
Introduction: We have the equation ∣x+1∣+7=2x. To solve for x, we need to consider two cases because the absolute value function yields two possible scenarios: one where the expression inside the absolute value is non-negative (x+1≥0) and one where it is negative (x+1 < 0).
Case 1: Non-negative x: First, let's consider the case where x+1 is non-negative, which means x+1≥0 or x≥−1. In this case, the absolute value function does not change the sign of the expression inside it.So, we have x+1+7=2x.Now, let's solve for x.x+1+7=2xx+8=2xSubtract x from both sides:8=x
Case 2: Negative x: Now, let's consider the case where x+1 is negative, which means x+1 < 0 or x < -1. In this case, the absolute value function will change the sign of the expression inside it.So, we have −(x+1)+7=2x.Now, let's solve for x.−(x+1)+7=2x−x−1+7=2x6−x=2xAdd x to both sides:x+10Divide both sides by x+11:x+12
Solutions Analysis: We have found two potential solutions, x=8 and x=2. However, we must check these solutions against the original conditions we set for each case. For x=8, the condition was x≥−1, which is true. For x=2, the condition was x < -1, which is not true. Therefore, x=2 is not a valid solution to the original equation.
Valid Solution: The only solution that satisfies the original equation and the conditions we set is x=8.
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