Piecing together thought processes for 9th century algebra … in the absence of a) symbolic algebra and b) negative numbers:
now: simplify 14 − (10 − x)
then: simplify [14] less [10 less x]
minuend: [14]
subtrahend: [10 less x]
• goal: ...
1/3
#UKMathsChat #iTeachMath #historyofmaths