Arnold K H Tan's answer to Unicorn's Secondary 2 Maths Singapore question.
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Use factorisation by grouping, where possible.
Author of several O-level Science guide books (my profile pic). My forte is tutoring O-level sciences (Chemistry, Physics, Biology). Telegram Messenger: @ChillXsg Note that only my tuition students have the privilege to direct message questions, to clarify.
Author of several O-level Science guide books (my profile pic). My forte is tutoring O-level sciences (Chemistry, Physics, Biology). Telegram Messenger: @ChillXsg Note that only my tuition students have the privilege to direct message questions, to clarify.
Date Posted:
2 years ago
for (g), 11/8 is correct by -1/2 is not correct.
should be u = 11/8 or 9/4.
for (h), both answers incorrect.
should be w = 13 or 11/5
need not have expanded.
can bring all terms to one side and factorise as
a^2-b^2 = (a+b)(a-b).
can check each answer by substituting back into equation to verify that the answer satisfies the equation.
should be u = 11/8 or 9/4.
for (h), both answers incorrect.
should be w = 13 or 11/5
need not have expanded.
can bring all terms to one side and factorise as
a^2-b^2 = (a+b)(a-b).
can check each answer by substituting back into equation to verify that the answer satisfies the equation.
You are right. Silly addition/subtraction errors made. Have posted the corrections, thanks.
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