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Q1.    Check whether the following are quadratic equations :

                (iv)    (x-3)(2x+1) = x(x+5)

Answers (1)


L.H.S. (x-3)(2x+1) can be written as:

= 2x^2+x-6x-3 = 2x^2-5x-3

and R.H.S (x)(x+5) can be written as:

= x^2+5x

\Rightarrow 2x^2-5x-3 = x^2+5x

i.e., x^2-10x-3 = 0

This equation is of type: ax^2+bx+c = 0,a\neq0.

Hence, the given equation is a quadratic equation.

Posted by

Divya Prakash Singh

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