Maths-
SAT
Easy
Question
2x3 + 11x2 + 5x
Which of the following is NOT a factor of the polynomial above?
- x
- x + 5
- 2x + 1
- 2x + 5
The correct answer is: 2x + 5
2x3 + 11x2 + 5x = x(2x2 + 11x + 5)
=x(2x2 + 10x + x + 5)
= x(2x(x + 5) + 1(x + 5))
= x((2x + 1)(x + 5))
The factors of the given polynomial are
x, 2x + 1 & 2x + 5.
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