How to verify answer a- 2b+c for the equation -3x-2y+8=0
Answers
Answered by
1
Answer:
x
2
+ax+8=0 has one of it roots as 4
⇒4
2
+4a+8=0
⇒4[4+a+2]=0
⇒6+a=0
⇒a=−6
Now, the equation
⇒x
2
+ax+b=0
x
2
−6x+b=0
has double ( equal ) roots.
In a quadratic equation, the roots will be equal if and only if the discrimination (D)=0
Now, the discriminant of the above quadratic equation is
⇒D=B
2
−4AC=0
⇒6
2
−4.1.b=0
⇒6
2
=4b
⇒b=
4
36
=9
∴a=−6 and b=9
Hence, the answer is 9.
Step-by-step explanation:
Answered by
0
Answer:
−4.1.b=0
⇒6
2
=4b
⇒b=
4
36
=9
∴a=−6 and b=9
Hence, the answer is 9.
Step-by-step explanation:
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