Question: For x 2 + Bx + C = ( x + a)( x + b), which of the following must be true? (a) ab =

For x² + Bx + C = ( x + a)( x + b), which of the following must be true?
(a) ab = B and a + b = C
(b) a + b = C and a − b = B
(c) ab = C and a + b = B
(d) ab = B and a − b = C

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