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Question

Factorize 3 x2 + 5x + 23 = 0 into (ax+b)(cx+d)=0. What is the value of a + b + c - d ?

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Solution

Multiply 3 with 23 and we get 6

Pairs of 6 are

1×6 = 6 sum 1+ 6 = 7

2×3= 6 sum 2+ 3 = 5

So our required pair is 2 and 3

3 x2 + 5x + 23 = 0

3 x2 + 3x + 2x +23 = 0

3x(x+3 )+ 2(x+3 )= 0

(3x + 2) (x + 3) = 0

a= 3​, b = 2, c = 1, d = - 3

a + b + c - d = 3


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