Susu is solving the quadratic equation 4x2 – 8x – 13 = 0 by completing the square. Her first four steps are shown in the table. In which step did Susu first make an error? Step 1 Step 2 Step 3 Step 4

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aliassss0214 aliassss0214 · Answer 1 · 2019-06-27T20:56:14+02:00

Answer:

Step 3

Step-by-step explanation:

when solving by completing the square you are supposed to do (b/2)^2 and then add that to both sides.

In your example (-8/2)^2=16

You are supposed to add sixteen to both sides not 64

Susu forgot to divide 8 by 2 before she raised it to the to the second powerm that is why she got 64, which is incorrect.

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lisboa lisboa · Answer 2 · 2019-07-24T15:36:17+02:00

Answer:

Step 2

Step-by-step explanation:

Susu is solving the quadratic equation [tex]4x^2 - 8x - 13 = 0[/tex] by completing the square

To apply completing the square method we need to get x^2 alone

Susu added 13 on both sides . So step 1 is correct

When we factor out 4, we divide both terms by 4

[tex]4(\frac{4x^2}{4} -\frac{8x}{2} )=13[/tex]

[tex]4(x^2-2x)=13[/tex]

Susu forgot to divide 8 by 4

So , error in step 2