O-LevelAdditional MathematicsEquations, inequalities and graphs4037/12 · Oct/Nov 2025 · Q65 Marks
Solve the equation |2x²+x-10|= 5.
- Solve the equation |2x²+x-10|= 5.[5]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2025). The mark or mark type is shown in brackets.
- [5] M1 2x²+x-10=5 leading to 2x² +x−15=0 with a valid attempt to solve to obtain 2 values for x
- A1 For both x=-5/2, 3
- M1 Must be a correct 3-term quadratic equated to zero
- Dep M1 for a valid method of solution to obtain 2 values for x. Mark final answer for this equation, A0 if negative root is rejected Denominator of final answer must be positive
- A1 For both x=(-1±√41)/4 oe
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