Question

please answer me questions no 3,4 my dear geniuses??

Answer 1

hope helped this to yu

Answer 2

Thanks for asking !!

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Answer : 3

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Given :

lx^2 + mx + n = 0 is a quadratic equation

To find :

If one root of the above quadratic equation is double the other then find condition

Solution :

Let x be the one of the given root of this  quadratic equation then other root will be 2x

Finding Sum :

Sum of Zeroes = -Coefficient of x/Coefficient of x^2

x + 2x = -m/l

x = -m/3l -----> 1

Finding Product :

Product of zeroes = Constant/Coefficient of x^2

x * 2x = n/l

x^2  = n/2l -----> 2

From (1)  and (2)

(-m/3l)^2 = n/2l

-m^2/9l^2 = n/2l

⇒ $2m^2 = 9nl$

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Answer : 4

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Given :

$\frac{Cos ( 90 - A) CosA}{CotA} - 1$

Put the values accordingly to concepts :

$\frac{SinA \ CosA }{\frac{CosA}{SinA} } - 1$

$Sin^2A - 1$

$Cos^2A$

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