MATHS · TECH · IDEAS
Second Almighty
One step at a time, to the top.
Math (maths) problems with checked, step-by-step solutions for Grade 9-12, Year 10-13 and Class 10-12, anywhere in the world.
Worked solutions
Video + worked solutionSmallest Value of a Quadratic Without Calculus: Complete the SquareHow to find the minimum of x² − 6x + 13 (and of x + 9/x) with no calculus: complete the square, then use the fact that a square is never negative. Worked solutions for Grade 9-10, Year 10-11, GCSE, SAT and Class 10 math (maths).Video + worked solutionSolve Any Quadratic Equation: 3 Methods With Worked ExamplesFactorising, the quadratic formula and completing the square, each with one fully worked example, plus how the discriminant decides the number of roots and where the formula comes from. For Grade 9-10, Year 10-11, GCSE, SAT and Class 10 math (maths).
Find your level
| Grade (US) | Year (UK) | Class (India) |
|---|---|---|
| 9-10 | 10-11 | 9-10 |
| 11-12 | 12-13 | 11-12 |
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see why it works, one step at a time
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puzzles, tech and ideas beyond the syllabus
puzzles, tech and ideas beyond the syllabus
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exams, real life and technology
exams, real life and technology
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build skill and confidence, one step at a time
build skill and confidence, one step at a time