Mathematics

Azul Lambert

1 September, 15:26

Israel started to solve a radical equation in this way: square root of x plus 6 - 4 = x square root of x plus 6 - 4 4 = x 4 square root of x plus 6 = x 4 (square root of x plus 6) 2 = (x 4) 2 x 6 = x2 8x 16 x 6 - 6 = x2 8x 16 - 6 x = x2 8x 10 x - x = x2 8x 10 - x 0 = x2 7x 10 0 = (x 2) (x 5) x 2 = 0 x 5 = 0 x 2 - 2 = 0 - 2 x 5 - 5 = 0 - 5 x = - 2 x = - 5 solutions = - 2, - 5 what error did israel make?