Answers

The Brainliest Answer!
2015-07-31T19:50:43+05:30
X²-20x+a=(x-b)²
⇒x²-20x-a=x²+b²-2bx
⇒x²-x²-20x-a=b²-2bx
⇒b²-2bx+20x-a=0
⇒b²-x(2b-20)-a=0
for this quadratic equation:
Discriminant D= B²-4AC
And A=1'B=2b-20;C=-a
Then;
(2b-20)²4a=0
⇒b²+100-20b-a=0
⇒10²+b(b+20)-a=0
Now again for the quadratic equation th 
Discriminant D=B²-4AC
B=10,A=1,C=-a
So
(b+20)²+4a=0
If i will type the complete solution it will go very long.
The value of a =12
and The value of b=-8
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