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secondary 3 | A Maths
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Help Tom! Anyone can contribute an answer, even non-tutors.
Hello! Please help with this question thanks you so much!
Date Posted: 1 year ago
Views: 386
first expand (2+y)^5 up to y^2 term,
then in the expansion, replace y by (3x-4x^2).
for cases where the expression in the brackets is factorisable, you can also factorise, then expand each factor and multiply the 2 expansions together.
since the question asks for the first three terms, it means you need the first three non-zero terms. normally, you only need to care about terms up to x^2. in the case where any of the 1st three terms are zero, then you need to find additional terms until you have three non-zero terms.
then in the expansion, replace y by (3x-4x^2).
for cases where the expression in the brackets is factorisable, you can also factorise, then expand each factor and multiply the 2 expansions together.
since the question asks for the first three terms, it means you need the first three non-zero terms. normally, you only need to care about terms up to x^2. in the case where any of the 1st three terms are zero, then you need to find additional terms until you have three non-zero terms.
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