Asked by XXX
For what real values of c is 9x^2 + 16x + c the square of a binomial? If you find more than one, then list your values in increasing order, separated by commas.
Answers
Answered by
Damon
do you know about completing the square?
(3x + y)(3x+y)= 9 x^2 + 6xy + y^2
6 y = 16
y = 8/3
y^2 = 64/9
so
9 x^2 + 16 x + 64/9
(3x + y)(3x+y)= 9 x^2 + 6xy + y^2
6 y = 16
y = 8/3
y^2 = 64/9
so
9 x^2 + 16 x + 64/9
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