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  • Which of the following are quadratic equation?Option: 1 <img alt="(2x-1)(2x+1)=(x+4)" src="https://learn.careers360.com/latex-image/?%282x-1%29%282x&

Which of the following are quadratic equation?

Option: 1

(2x-1)(2x+1)=(x+4)


Option: 2

x(x+3)=(x+1)(x+2)


Option: 3

(x+2)^3=2x


Option: 4

Both (a) and (b)


Answers (1)

best_answer

 

(a) (2x-1)(2x+1)=(x+4) is simplified to 4x^2-x-5=0

(b) x(x+3)+6=(x-2)(x+2)

\begin{array}{l} x(x+3)+6=(x+2)(x-2) \\ \Rightarrow \quad x^{2}+3 x+6=x^{2}-4 \\ \Rightarrow \quad 3 x+10=0 \end{array}

Posted by

SANGALDEEP SINGH

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