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fredd [130]
3 years ago
11

If -5 is a root of the quadratic equation 2x^2+px+15=0 and the equation p(x^2+x) +k=0 has equal rootsv then find p and k

Mathematics
1 answer:
grigory [225]3 years ago
4 0

Answer:

p=13, k = 3.25

Step-by-step explanation:

First, determine p:

2x^2+px+15=0\\x=-5:\\2(-5)^2+p(-5)+15=0\\-5p+65=0\\\implies p=13

Use this value in the second equation

13(x^2+x)+k=0

and write the condition for that equation having equal roots, i.e., its determinant must equal 0:

13x^2+13x+k=0\\D=b^2-4ac=13^2-4\cdot13\cdot k=0\\52k=169\implies k = 3.25


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