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secondary 2 | Maths
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How do I find the minimum value of y? (Part c) also, how do I find the other quadratic function? (Part d)
Date Posted: 6 years ago
Views: 418
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For (c), use completing the square method.
For (d), notice that we are only able to form 2 equations although we have 3 unknowns (a,b,c) to solve. This means that there are many possible solutions and not just one. You can "fix" a or b or c to be any number* and then solve for the remaining two unknowns. *caution: you cannot fix c = 0 because it means that the y-intercept is 0, and a quadratic curve cannot satisfy y-intercept=0 and still pass through points B and C because that is essentially a straight line.
Lastly, a good practice to ensure your answer is correct is to try substituting the points B and C into your function and see if it tallies. Hope this helps.
For (d), notice that we are only able to form 2 equations although we have 3 unknowns (a,b,c) to solve. This means that there are many possible solutions and not just one. You can "fix" a or b or c to be any number* and then solve for the remaining two unknowns. *caution: you cannot fix c = 0 because it means that the y-intercept is 0, and a quadratic curve cannot satisfy y-intercept=0 and still pass through points B and C because that is essentially a straight line.
Lastly, a good practice to ensure your answer is correct is to try substituting the points B and C into your function and see if it tallies. Hope this helps.
Thank u!
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