If x³ − 3x² + 3x + 7 = (x + 1)(ax² + bx + c), Find a + b + c

If x³ − 3x² + 3x + 7 = (x + 1)(ax² + bx + c), Find a + b + c

If \[ x^3-3x^2+3x+7=(x+1)(ax^2+bx+c), \] then \[ a+b+c= \]

(a) \(4\)

(b) \(12\)

(c) \(-10\)

(d) \(3\)

Solution

Put \[ x=1 \]

\[ 1-3+3+7=(1+1)(a+b+c) \]

\[ 8=2(a+b+c) \]

\[ a+b+c=4 \]

Therefore,

\[ \boxed{(a)\ 4} \]

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