Question

Please help ASAP!!!!

Answer 1

$Luis\: didn't\: solve\: the\: function\: properly, because\: in\: line\: 4: \sqrt{16} = 4, instead \: he \: wrote \: \sqrt{16} = \sqrt{4}$

Answer 2

Answer:

Luis didn't solve the question properly.

Line 4 is not correct.

Step-by-step explanation:

We have given a quadratic equation.

-x²+10-21  = y

The question is solved in given pic.

The quadratic formula is applied to given equation.

Line 4 is not correct because √16 ≠ √4

Line 4 : x = -10±4 / (-2)

 x = -10+4 / (-2) ; x = -10-4 / (-2)

 x = -6/-2      ;   x = -14/-2

 x = 3     ;      x  = 7 which is correct answer.

Luis didn't solve the question properly.

Line 4 is not correct.