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secondary 3 | E Maths
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hi need help with qn5 both parts
Date Posted: 4 years ago
Views: 222
if the roots of a quadratic equation are A and B, then the equation would be (x-A)(x-B)=0. then just expand and rearrange to the required format.
for (a), the equation would be …
(x-2)(x-(6/7))=0
(x-2)(7x-6)=0
7x^2-20x+12=0
for (b), you can try it out on your own, using same idea as above.
alternatively, you may have learnt …
x^2-(sum of roots)x+(product of roots)=0,
then rearrange to required format.
for (a), the equation would be …
(x-2)(x-(6/7))=0
(x-2)(7x-6)=0
7x^2-20x+12=0
for (b), you can try it out on your own, using same idea as above.
alternatively, you may have learnt …
x^2-(sum of roots)x+(product of roots)=0,
then rearrange to required format.
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