Ask Singapore Homework?

Upload a photo of a Singapore homework and someone will email you the solution for free.



Question

secondary 3 | E Maths
3 Answers Below

Anyone can contribute an answer, even non-tutors.

Answer This Question
Ethan
Ethan

secondary 3 chevron_right E Maths chevron_right Singapore

Pls help me w qns 1(b) & (d) and qns 2(b) & (h). Thanks

Date Posted: 3 months ago
Views: 69

See 3 Answers

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Crystal Loh Ming-En
Crystal Loh Ming-en's answer
6 answers (Tutor Details)
1st
1b: Whenever the coefficient of x^2 is more than 0, then the quadratic equation can only be solved by using the formula method
Ethan
Ethan
3 months ago
Thank you. I will need to take note of this and remember to use the formula method.
Ethan
Ethan
3 months ago
Thank you!
done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Crystal Loh Ming-En
Crystal Loh Ming-en's answer
6 answers (Tutor Details)
1d: By looking at the equation, we can tell that the coefficient, 4 and the constant, 49 are actually square numbers. Therefore, we can factor the equation to solve it, instead of using the formula method, as it will be longer to solve

2b: Since the equation is already factorised, we can just bring the square (^2) over to the right hand side of the equation to make the equation on the left hand side easier to solve. Do take note, when we square root a number, always put in the plus minus sign beside the square root, as square roots can be negative or positive
done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Crystal Loh Ming-En
Crystal Loh Ming-en's answer
6 answers (Tutor Details)
2h: similar to Qn 2b, since the question is already factorised, we can just bring over the square (^2) to the right hand side of the equation. Do take note that in this question, the variable that we are solving for is negative, therefore, we need to 'flip' the the negative sign to positive. Thus, when we do something to one side of the equation, we must do the same to the rest of the equation
Ethan
Ethan
3 months ago
Thank you so much and thank you for explaining how to tackle the questions!
Crystal Loh Ming-En
Crystal Loh Ming-En
3 months ago
No problems!! Glad that it helped you ;-)