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Maths CBSE Live product
Class 8
We Distribute, Yet Things Multiply
Problems using identities
7.
Evaluate
Question:
3
m.
If \(x + y =10\) and \(x - y =18\), then find the value of \(x^2 - y^2\) without finding the values of \(x\) and \(y\).
Answer:
The idenity used to compute the value of \(x^2 - y^2\) is:
\((a-b)^2 = a^2 - 2ab + b^2\)
\((a+b)^2 = a^2 + 2ab + b^2\)
\(a^2 - b^2 = (a+b)(a-b)\)
None of these
The value of \(x^2 - y^2\) is:
100
28
180
324
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