Find the constant c for the following expression, assuming it's a perfect square. What did we need to square to result in the expression?
x2 + 50x + c
Answer
c = 625, squared (x + 25)
x2 – 14x + c
c = 49, squared (x – 7)
x2 + 15x + c
, squared
9x2 – 60x + c
c = 100, squared (3x – 10)
25x2 + 120x + c
c = 144, squared (5x + 12)
Solve, or state that the equation has no real number solutions:
x2 + 2x = 2
,
x2 – 4x = 12
x = 6, x = -2
2x2 + 16x – 18 = 0
x = 1, x = -9
4x2 – 4x + 1 = 144
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