Question

If x2 + 6x + c = (x + d)2, then d

Answer 1

c=9

d=3

Explanation:

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Answer 2

d = 3

Explanation:

Expand the right side and compare the coefficients of like terms

x² + 6x + c = x² + 2dx + d²

For the 2 sides to be equal then coefficients of like terms must be equal

compare coefficients of x- terms, then

2d = 6 ⇒ d = 3