The quadratic formula is the result of completing the square for ax^2+bx+c=0 when a,b, and c are unknown values. This result is:
x=(-b±√(b^2-4ac))/(2a), we have x^2-x-2=0 so
x=(1±√(1+8))/2
x=(1±√9)/2
x=(1±3)/2
x=-1 and 2
7^2+5^2= 74 now you have to square root 74 which is 8.60233 or 8.6
81a²-25 would be the answer I'm pretty sure. Hopefully I helped.
Answer:
The Points are too little for this many questions
Step-by-step explanation:
Make it like 25 Points then people will answer it
Step-by-step explanation:
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