Answer:
(7x + 1)(x - 7).
Step-by-step explanation:
y = 7x^2 - 48x - 7
Use the 'ac' method:
7 * 7 = 49
Now we need 2 numbers whose product is 49 and whose sum is the 'middle' number -48.
They are -49 and 1,
Now we write the function as:
7x^2 - 49x + 1x - 7
= 7x((x - 7) + 1(x - 7) (x - 7) is common so we have
(7x + 1)(x - 7).
