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Erlina Ronda

Works at University of the Philippines

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### Erlina Ronda

Shared publicly -Just because you cannot use the term derivative does not mean you can't teach it yet. This post suggests a way of introducing the derived function to Grade 10.

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### Erlina Ronda

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One-on-one Private Academic Tutoring for Secondary School Students I'm an e-tutor on MATH & FRENCH. Other sciences & European languages available by coleagues. For detail on 1/1 tutoring, please call me at +33 6 1943 4965 or Skype Jean-Yves Rollin ØØØ E.B.S Paris 1979

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### Erlina Ronda

Shared publicly -This post describes different types of problem solving tasks we normally use in teaching mathematics.

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### Erlina Ronda

Shared publicly -Before I answer the question in the title, we need to do some revisions: This is what you do when you solve a quadratic equation like x^2-3x-10=0 : Solution: => (x-5)(x+2)=0. => If x-5 = 0, then x = 5; if x+2 = 0, then x =-2. The solution is x=5 or x=-2. If you graph the equation, ...

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### Erlina Ronda

Shared publicly -Problem. Two lines intersect the graph y=x^2 . The secant line intersects the graph at point A and B and the tangent line which is parallel to the secant, touches the graph at point E. You can read the coordinates of A and B from the graph but not E. What are the coordinates of E? What are the ...

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### Erlina Ronda

Shared publicly -The discriminant of a quadratic equation, ax2 + bx + c = 0 is D = b2 – 4ac. If D>0, the quadratic equation has two distinct roots; if D<0, then the equation has no real roots; and, if D=0, the we have two equal roots. Let's apply it in the following problem.

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