Algebra · real student question

Solve the inequality 3x - 5 > 2(x - 2).

Question

Solve

3x5>2(x2)3x-5>2(x-2)

Step-by-step solution

  1. Distribute the 22 over the bracket. Multiply both terms inside by 22, taking care with the minus sign:

    2(x2)=2x43x5>2x42(x-2)=2x-4\quad\Longrightarrow\quad 3x-5>2x-4

  2. Subtract 2x2x from both sides. The larger coefficient is on the left, so collecting there keeps things positive:

    x5>4x-5>-4

  3. Add 55 to both sides.

    x>1x>1

    The coefficient of xx is already 11, so there is no division step and therefore no opportunity for a sign flip.

  4. Test the two regions and the boundary. At x=5x=5: left =10=10, right =6=6, and 10>610>6 \checkmark. At x=0x=0: left =5=-5, right =4=-4, and 5>4-5>-4 is false \checkmark. At x=1x=1 both sides equal 2-2, so the strict inequality rightly excludes it. Solution set: (1,)(1,\infty).

Answer

x>1,i.e. (1,)x>1,\qquad\text{i.e. }(1,\infty)

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