Question

x2  - 3x -28 = 0


x2 + 12x + 36 = 0


6x2 –x – 1 = 0


x2  - 4x  - 4 =


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Answer 1

$a)x2  - 3x -28 = 0 \\ 2x - 3x - 28 = 0 \\ - x - 28 = 0 \\ - x = 28 \\ x = - 28$

$b) x2 + 12x + 36 = 0 \\ 2x + 12x + 36 = 0 \\ 14x + 36 = 0 \\ 14x = - 36 \\ x = - \frac{18}{7}$

$c)6x2 - x - 1 = 0 \\ 12x - x - 1 = 0 \\ 11x - 1 = 0 \\ 11x = 1 \\ x = \frac{1}{11}$

$d)x2 - 4x - 4 \\ 2(x - 2x - 2) \\ 2( - x - 2)$