Covid19 has spread globally. When the Covid-19 pandemic occurs, schools must be closed or partially opened, which affects teaching and learning. Educational innovations to deal with epidemics such as Covid-19 and other urgent epidemics are very important. Therefore, the three cores of Education 4.0 knowledge applicable to pandemics such as COVID-19 are simple, self-learning and technology-integrated knowledge (SST knowledge).

Simple knowledge is the most important core of Education 4.0 , it same as Albert Einstein quotes: everything should be made as simple as possible, but not simpler, If you can't explain it simply you don't understand it well enough, We cannot solve our problems with the same thinking we used when we created them.

The Objective of Peter Chew Theorem is to make it easier and faster to solve the problem of quadratic roots, by converting any value of the Quadratic Surds1,2 ( a+bc ) into the sum or difference of two real numbers or the sum or difference of two complex number.

Peter Chew theorem is AI age knowledge because the theorem can help convert all Quadratic Surds ( a+bc ) . In addition, the theorem can help convert easier and faster than current method. This will cause students to increase their interest in using Peter Chew theorem and increase the promotion of effective mathematics learning. When the future epidemics such as Covid-19 occur in the future, it can effectively help mathematics teaching, especially for students studying at home.

Peter Chew Theorem can also convert the square root of a complex number into a complex number (the sum or difference between the real part and the imaginary part), because the square root of the complex number is also the quadratic surd

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