Solve .
Answer and explanation
Correct answer: D. or
- Step 1: Find two numbers that multiply to and add to : and .
- Step 2: Factorise: .
- Step 3: Each bracket can be zero, so or .
Answer
or .
Why not the others: or : The signs have been flipped: these would give . or : These multiply to but add to , not . or : This reads the coefficients and as the solutions.
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