What is the greater solution of ?
Answer and explanation
Correct answer: C. 8
- 1 is the absolute value of the coefficient of , not a root.
- -7 is the smaller of the two solutions ().
- -8 reverses the signs of the roots, erroneously using factors .
- -7 is the smaller of the two solutions ().
- -8 reverses the signs of the roots, erroneously using factors .
- Step 1: Factor the quadratic equation: find two numbers that multiply to and add to , giving .
- Step 2: Set each factor to zero to find the roots: and .
- Step 3: Compare the two solutions: between and , the greater solution is .
Answer
8.
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