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## Answers (1)

This is a quadratic Equation. If A=3, B=5 and C=k.......the formula for quadratic equations is -b under root b^2 - 4ac over 2a. For this quadratic equation to only have 1 real value, the determinant(b^2 -4ac) has to be 0. lets put the values of A, B and C. it becomes, 5^2 - 4*3*k. this becomes, 25-12k. this has to be 0 so we get, 25-12k = 0.

-12K = 25

K = 25 divide by -12

K = 25/-12

Reference:My Brain