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21 October, 05:36

Find the value of c that will make 9x2 + 30x + ca perfect square trinomial.

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  1. 21 October, 07:15
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    Step-by-step explanation:

    (a+b) ²=a²+2ab+b²

    9x²+30x+ca

    = (3x) ²+2*3x*5+c

    = (3x) ²+2*3x*5+5²-5²+c

    = (3x+5) ²-25+c

    it is a perfect square if - 25+c=0

    or c=25
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