Answer:
Step-by-step explanation:
At a sale, coats were sold for $17 each. If the coats originally cost $20 each, what percentage of its original price was a coat
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Answer:
Step-by-step explanation:
<u>Given </u><u>:</u><u>-</u>
- A quadratic equation is given to us.
- The equation is 9x² + 30x + c .
And we need to find out the value of c for which the given trinomial is a perfect square. On looking at the given expression all the terms are having positive signs before them .So we can rewrite it on the basis of ,
<u>Identity</u><u> </u><u>:</u><u>-</u><u> </u>
Let's try to set the equation on this Identity .
The firsr term is 9x² . We can write it as ,
Hence the middle term here should contain 3 and 2 as their factors. Let's Break the middle term .
Therefore in order to make the whole expression as perfect square 5² must be replaced by c . The expression would become ,
<u>Hence </u><u>the </u><u>value </u><u>of </u><u>c </u><u>should</u><u> be</u><u> </u><u>2</u><u>5</u><u> </u><u>.</u>
