Word problems related to quadratic equation
Ages, numbers, digits · Triangles, land, money
Write a condition given in words as an equation
Solve it by splitting the middle term
Reject roots that do not fit the story
Solve age, digit, triangle, land and money problems
Now: 12 × 18 = 216
1 year later: 13 × 19 = 247
2 years later: 14 × 20 = 280
Algebra: (12 + x)(18 + x) = 280
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