🎓 Deeper Dive — Adults

Algebra generalises arithmetic. A variable is a placeholder for any number.

Solve linear: isolate the variable. 2x + 3 = 11 → subtract 3 → 2x = 8 → divide by 2 → x = 4. Always do the same operation to both sides.

Like terms: 3x + 5x = 8x; 3x + 4y do not combine.

Quadratics: ax² + bx + c = 0 has roots x = (−b ± √(b²−4ac)) / 2a.