Math Olympiad question: If the equation in x has

Leonard Montes

Leonard Montes

Answered question

2022-04-16

Math Olympiad question:If the equation in x has real roots, then find the value of a and b.
x2+2(1+a)x+(3a2+4ab+4b2+2)=0

Answer & Explanation

coesarfaujs3t

coesarfaujs3t

Beginner2022-04-17Added 11 answers

For at least one real root:
b24ac0
So: [2(1+a)]24(3a2+4ab+4b2+2)(1)0
1+a2+2a3a24ab4b220
a2+2ab+2b2a+10
(a+b)2+b2a+10
StettyNagEragpouj

StettyNagEragpouj

Beginner2022-04-18Added 7 answers

You have an error in the line a2+2ab+2b2a+10. It should be
a2+2ab+2b2a+120
and it can be rewritten as
12a+2b2+12a120.
Now you should know what to do.

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