Question

please say answers very fast ​

Answer 1

AnSwEr

${\tt{\red{\underline{\large{Given}}}}}$

• Problems Related to quadratic equations

${\sf{\green{\underline{\large{To\:find}}}}}$

• Choose the correct Answer

${\sf{\pink{\underline{\Large{Explanation}}}}}$

X + 1/X = 5/2

we have to find discriminant

__________________________

(x²+1 )2=5x

=2x²+2-5x=o

we know that

• D=b²-4ac

Putting the value in D

=>D=25-4×2×2

=>D=25-16

=>D=9

Option A is Right

__________________________

2).

__________________________

x+ 1/x =?

x²+2x+1=0

=>x²+x+X+1=0

=>X(X+1)+1(X+1)=0

=>X=-1,-1

Putting the value in x+ 1/x =?

x+ 1/x =?

=>x+ 1/x

=>-1-1

=>-2

Option D is correct

__________________________

3)

__________________________

• Roots are equal to the Equation

Therefore

b²-4ac=0

b²=4ac

here c is a constant

Therefore answer is 4a

Option A is correct

__________________________

4).

__________________________

Let alpha = A and Beta = B

x²-px+q=0

we know that

=>A+B=-b/a = -p

=>A×B=c/a =q

Then

A+B)² = A²+B²+2AB

=>p²-2q=A²+B²

Option A is

__________________________