Question

kahal solved the inequlity 4x-4>20. his work is shown below. step 1: 4x-4>20 step 2: 4x>16 step 3: x>4 where did kahal make an error in his calculation? explain.

Answer 1

Kahal made an error in step 1 in his calculation.

Step-by-step explanation:

Inequality solved by Kahal;

4x-4>20

Steps used by Kahal

step 1: 4x-4>20

step 2: 4x>16

step 3: x>4

Kahal made mistake in first step where he subtracted 4 from 20. because to eliminate 4 we will add 4 on both sides which will make;

Step 1: 4x-4+4 > 20+4

4x>24

Thus,

Kahal made an error in step 1 in his calculation.

Keywords: inequality, addition

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