Q. Solve the equation for all values of x.∣2x−10∣−4=4xAnswer: x=
Isolate absolute value: We have the equation ∣2x−10∣−4=4x. To solve for x, we first need to isolate the absolute value expression on one side of the equation.Add 4 to both sides of the equation to isolate the absolute value.∣2x−10∣−4+4=4x+4∣2x−10∣=4x+4
Positive case equation: Now we have ∣2x−10∣=4x+4. The absolute value equation can be split into two separate equations, one for the positive case and one for the negative case.For the positive case:2x−10=4x+4
Solve positive case: Solve the positive case equation from Step 2.Subtract 2x from both sides:2x−10−2x=4x+4−2x−10=2x+4Now, subtract 4 from both sides:−10−4=2x+4−4−14=2xFinally, divide by 2:−14/2=2x/2−7=x
Negative case equation: For the negative case, we consider the expression inside the absolute value as negative: −(2x−10)=4x+4Simplify the negative sign:−2x+10=4x+4
Solve negative case: Solve the negative case equation from Step 4.Add 2x to both sides:−2x+10+2x=4x+4+2x10=6x+4Now, subtract 4 from both sides:10−4=6x+4−46=6xFinally, divide by 6:66=66x1=x
Check x=−7: We have found two potential solutions for x: x=−7 and x=1. However, we must check these solutions in the original equation to ensure they do not result from extraneous solutions introduced by the absolute value.Check x=−7:∣2(−7)−10∣−4=4(−7)∣−14−10∣−4=−28∣−24∣−4=−2824−4=−2820=−28The solution x=−7 does not satisfy the original equation, so it is an extraneous solution.
Check x=1: Check x=1: |2(1)−10| - 4=4(1) |2−10| - 4=4 |−8| - 4=4 8−4=4 4=4 The solution x=1 satisfies the original equation, so it is a valid solution.
More problems from Evaluate absolute value expressions