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(x+y)^2 + (x-y)^2 and (x+y)^2 - (x-y)^2

Question 1vii...

Question

Question 1(vii)
Use a suitable identity to get each of the following products:
$(6 x - 7) (6 x + 7)$

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Solution

$(6 x - 7) (6 x + 7)$
$= (6 x)^{2} - (7)^{2} [U s i n g t h e i d e n t i t y (a - b) (a + b) = a^{2} - b^{2}$ ] $= 36 x^{2} - 49$

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(x+y)^2 + (x-y)^2 and (x+y)^2 - (x-y)^2

Standard VIII Mathematics

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