Question

If a and b are zeroes of the x2 + 7x + 7, find the value of a-1 + b-1 -2ab

Answer 1

X²+7x+7=0

x= -b+ or - √b²-4ac/2a

x=-7 + or - √7²-4×7/2

x= -7 + or - √49-28/2

x= -7 + or - √21/2

so,

x= -7 + √21/2 (alpha)

and

x= -7 - √21/2 (beta)

note:- divided by 2 is for whole and not only for √21

Answer 2

Answer:

thank you for your time and consideration