Question

7. Find the value of m so that the equation x2 - 4x + m - 4 = O has equal roots. 1) 8 2) 10 3) 12 4)9 << 了 8. If the CGST of the bag bought by Somali is Rs 1200 Then th​

Answer 1

Answer:

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Answer 2

The value of m so that the equation x^2-4x+(m-4)=0x2−4x+(m−4)=0 has equal roots is 8

Step-by-step explanation:

The given quadratic equation is

x^2-4x+(m-4)=0x2−4x+(m−4)=0

We know that discriminant of a quadratic equation ax^2+bx+c=0ax2+bx+c=0 is given by

D=b^2-4acD=b2−4ac

We also know that if a quadratic equation has equal roots then its discriminant should be zero

i.e. D=0D=0

Since the given quadratic equation has equal roots

Therefore,

(-4)^2-4(m-4)=0(−4)2−4(m−4)=0

16-4m+16=016−4m+16=0

4m=324m=32

\implies m=8⟹m=8

Step-by-step explanation:

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