Find the product of the roots of x^2 - 5x + 4 = 0.
Answer and explanation
Correct answer: A. 4
- Step 1: For ax^2 + bx + c = 0, the product of the roots is c/a.
- Step 2: Here a = 1 and c = 4, so the product is 4.
Answer
4.
Why not the others: '5' is the sum of the roots; '-4' uses the wrong sign for c/a; '20' multiplies the sum and the product.
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