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Solve the equation for all values of 
x.

|2x+9|=x
Answer: 
x=

Solve the equation for all values of x x .\newline2x+9=x |2 x+9|=x \newlineAnswer: x= x=

Full solution

Q. Solve the equation for all values of x x .\newline2x+9=x |2 x+9|=x \newlineAnswer: x= x=
  1. Consider Non-Negative Case: We have the equation 2x+9=x|2x + 9| = x. To solve this, we need to consider two cases because the absolute value function outputs the distance from zero, which is always non-negative. The two cases are when the expression inside the absolute value is non-negative and when it is negative.
  2. Solve for x: First, let's consider the case when the expression inside the absolute value is non-negative, which means 2x+902x + 9 \geq 0. In this case, the absolute value function does not change the sign of the expression inside it.\newlineSo we have 2x+9=x2x + 9 = x.\newlineNow, let's solve for x.\newlineSubtract xx from both sides to get x+9=0x + 9 = 0.\newlineSubtract 99 from both sides to get x=9x = -9.
  3. Check Validity of Solution: We need to check if our solution from Step 22 satisfies the original condition 2x+902x + 9 \geq 0. Substitute xx with 9-9 and check: 2(9)+9=18+9=92(-9) + 9 = -18 + 9 = -9, which is not greater than or equal to 00. Therefore, x=9x = -9 does not satisfy the condition 2x+902x + 9 \geq 0, so it is not a valid solution.
  4. Consider Negative Case: Now, let's consider the second case when the expression inside the absolute value is negative, which means 2x + 9 < 0. In this case, the absolute value function changes the sign of the expression inside it.\newlineSo we have (2x+9)=x- (2x + 9) = x.\newlineNow, let's solve for x.\newlineDistribute the negative sign to get 2x9=x-2x - 9 = x.\newlineAdd 2x2x to both sides to get 9=3x-9 = 3x.\newlineDivide both sides by 33 to get x=3x = -3.
  5. Solve for x: We need to check if our solution from Step 44 satisfies the original condition 2x + 9 < 0. Substitute xx with 3-3 and check: 2(3)+9=6+9=32(-3) + 9 = -6 + 9 = 3, which is not less than 00. Therefore, x=3x = -3 does not satisfy the condition 2x + 9 < 0, so it is not a valid solution.
  6. Check Validity of Solution: Since neither of the solutions from Step 22 and Step 44 satisfy their respective conditions, we conclude that there are no solutions to the equation 2x+9=x|2x + 9| = x.

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