Q2 of 168 Page 7

Check whether the following are quadratic equations :

Given;

⇒ x3 + 1 = 5x


⇒ x3− 5x + 1 = 0


∵ The highest power of x in the equation is 3;


∴ It is not a quadratic equation.


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2

Check whether the following are quadratic equations:

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Check whether the following are quadratic equations :

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Check whether the following are quadratic equations :

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Represent the following situations mathematically:

John and Jivanti together have 45 marbles. Both of them lost 5 marbles each and the product of the number of marbles they now have is 124. We would like to find out how many marbles they had to start with.