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The expression ax^2 + bx + c is divisible by x - 1, has a remainder of 2 when divided by x - 1, and has a remainder of 8 when divided by x - 2. Find the values of a, b, c.
The expression ax^2 + bx + c is divisible by x - 1, has a remainder of 2 when divided by x - 1, and has a remainder of 8 when divided by x - 2. Find the values of a, b, c.
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ChatGPT
Sep 7
To find the values of a, b, and c, we can use the remainder theorem.
Since the expression is divisible by x - 1, we know that when x = 1, the expression equals 0. This gives us the equation:
a(1)^2 + b(1) + c = 0 a + b + c = 0
Since the expression has a remainder of 2 when divided by x - 1, we know that when x = 1, the expression equals 2. This gives us the equation:
a(1)^2 + b(1) + c = 2 a + b + c = 2
Since the expression has a remainder of 8 when divided by x - 2, we know that when x = 2, the expression equals 8. This gives us the equation:
a(2)^2 + b(2) + c = 8 4a + 2b + c = 8
Now we have a system of three equations:
1) a + b + c = 0 2) a + b + c = 2 3) 4a + 2b + c = 8
Subtracting equation 1 from equation 2 gives:
0 = 2
This is a contradiction, so there is no solution for a, b, and c that satisfies all three conditions.
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Google Gemini AI
Sep 7
Remainder Theorem:
When a polynomial f(x) is divided by (x - a), the remainder is f(a).
Step 1: Find a
Since the polynomial is divisible by (x - 1), a = 0.
Step 2: Write the polynomial in terms of b and c
0x^2 + bx + c = bx + c
Step 3: Find b
When divided by (x - 1), the remainder is 2. By the Remainder Theorem, 2 = b(1) + c. So, b = 2 - c.
Step 4: Find c
When divided by (x - 2), the remainder is 8. By the Remainder Theorem, 8 = b(2) + c = 2(2 - c) + c = 4 - 2c + c = 4 - c. So, c = 4.