Answer: x^2 + 6x – 7 = 0
The solutions x = -7 and x = 1 can be written as:
(x+7)(x-1) = 0
(Because you find the solution values for x from the brackets e.g (x+7) to get x=-7, dunno how to explain it better sry)
From which you can expand the brackets and find the answer in quadratic form.
(x+7)(x-1) = 0
Expand the brackets
x^2 + 7x – x – 7 = 0
x^2 + 6x – 7 = 0