Question

(1)
3. समीकरण x2-5x - 7 =0 के मूल होंगे ।
(a) वास्तविक एवं समान
(b) वास्तविक एवं आसमान
(c) काल्पनिक एवं असमान (d) इनमें से कोई नहीं​

Answer 1

Answer:

Step-by-step explanation:

x2-5x - 7 =0

a=1,b=-5,c=-7

discrimination=b2-4ac

=(-5)^2-4(1)(-7)

=25+28=53

atach mool :

vastvik abam asaman honge

Option(b)

Answer 2

Expression for a quadratic equations is form of

ax^2+bx+c=0

D=b^2-4ac

If D>0

Roots are real

If D=0

Roots are ReaL and EQUALS

If D≤0

Roots are Imaginary.

As according to your question

D= 25-4*1*-7

»D=25+28>0

So roots are real and unequal

Hence option (b) is correct