SAT Math · Equivalent expressions · medium
When the polynomial x³ + 3x² - x + 2 is divided by x - 2, what is the remainder?
When the polynomial is divided by , what is the remainder?
Answer and explanation
Answer: D: 20
By the remainder theorem, dividing a polynomial by leaves the remainder . Compute , choice D. Synthetic division with coefficients 1, 3, , 2 gives 1, 5, 9, 20, confirming the remainder. Choice A (2) is the root value used for the divisor. Choice B (14) comes from a sign slip in the last term, . Choice C () has the wrong sign and does not match . Evaluate at the root of , namely .
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