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secondary 2 | Maths
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I dont understand.
Date Posted: 4 years ago
Views: 251
Since (a+b)^2 = a^2 + 2ab + b^2
Their expecting you to apply substitution of the values given in the question to find 3(x+y)^2
If you expand 3(x+y)^2, it will be 3x^2 + 6xy + 3y^2
From there, you should rearrange the variables so its easier to understand, 3x^2 + 6xy + 3y^2 = 3x^2 + 3y^2 + 6xy
Now it should be easier to understand, from here all you have to do is sub in the values given in the questions so you will end up with :
3(14) + 6(5) = *72*
Their expecting you to apply substitution of the values given in the question to find 3(x+y)^2
If you expand 3(x+y)^2, it will be 3x^2 + 6xy + 3y^2
From there, you should rearrange the variables so its easier to understand, 3x^2 + 6xy + 3y^2 = 3x^2 + 3y^2 + 6xy
Now it should be easier to understand, from here all you have to do is sub in the values given in the questions so you will end up with :
3(14) + 6(5) = *72*
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Replace a with x and b with y to find (×+y)^2 using special product rule.
Date Posted:
4 years ago
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