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22 February, 11:18

This is Josh’s solution for the equation

x2-6x-7=0:

x2-6x-7=0

x2-6x=7

x2-6x+9=7+9

(x-3) 2=16

x=19

x-3=-16

x=-13

Is Josh’s solution correct? Explain

+1
Answers (1)
  1. 22 February, 13:40
    0
    No. After completing the square, Joshua should have taken the square root of the equation. As a result, he should have gotten:

    x - 3 = 4 OR x - 3 = - 4

    And the result answer would have been x = 7 or x = - 1
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