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secondary 4 | E Maths
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need help with this question !!
Date Posted: 6 years ago
Views: 273
Convert 9y² - 24y + c into the expanded square form first.
Remember that (a - b)² = a² - 2ab + b²
so 9y² - 24y + c
= (3y)² - 2(12y) + c
= (3y)² - 2(3y)(4) + c
Compare the terms here to a² - 2ab + b².
You will realise that ,
a = 3y
b = 4
And, c = b²
So c = 4² = 16.
Remember that (a - b)² = a² - 2ab + b²
so 9y² - 24y + c
= (3y)² - 2(12y) + c
= (3y)² - 2(3y)(4) + c
Compare the terms here to a² - 2ab + b².
You will realise that ,
a = 3y
b = 4
And, c = b²
So c = 4² = 16.
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