Leaving Cert Higher Level Maths 2020 Paper 1 Question 3

[@SimpleScienceandMaths]

Solutions to each question: Question 1: kzbin.info/www/bejne/o3u7aWmdaqh5i6M Question 2: kzbin.info/www/bejne/n3TWaIF-ppKfY7s Question 3: kzbin.info/www/bejne/h2api5Wfeq2hnsU Question 4: kzbin.info/www/bejne/foXZnqqGn96rbZo Question 5: kzbin.info/www/bejne/eHaUo2Zul7mtaac Question 6: kzbin.info/www/bejne/qqe1c3iCo8adqdk Question 7: kzbin.info/www/bejne/n5bXZ2huh7qFaqs Question 8: kzbin.info/www/bejne/aYaYYaGhnJuKr8k Question 9: kzbin.info/www/bejne/fXOaf6aEhsaVrMU

[@claireconway9534]

How did you change the log5y to get the 1+2 log5 x in the second line

[@MissSarahTallon]

Great Video! I approached (b)(ii) of the questions by converting back to indices using part (i). It is little bit more challenging, but a good way to save time for able students. The quadratic equation comes together within two lines. Overall, I prefer the way you approached it with logs, more accessible for the majority of students.

[@SimpleScienceandMaths]

Thanks Sarah! I actually didn't even think of your way! but it sounds quicker not having to mess around with the awkward log fraction...Lots of room for students to make an error in this question I reckon.

[@chaosforever]

Hi just wondering how did you simplify the equation at 6:04 to make it = 5?

[@andrewvaughan4177]

It’s the law for converting logs with indices, pg.21 of maths formula book. Log Y to the base A = X .. converts to A to the power of X = Y

[@elliemcmanus3415]

Where is the log55xsquared coming from at the beginning

[@SimpleScienceandMaths]

starting with y=5x^2, take the log base 5 of both sides.