Answer: x=-7 and x=8
Step-by-step explanation:
We need to find 2 numbers that multiply to make 56 and add up to make -1 (because of -x)
These would be 7 and 8, specifically +7 and -8
Therefore we factorise the quadratic to form (x+7)(x-8)=0
Now we know x=-7 and x=8
