Expand the expression — task. Maths CBSE Live product, Class 8.

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(5 + 7 s) (5 - 7 s)

Answer:

The identity used is

{(a + b) (a - b) = i}^{i} - i^{i}

(5 + 7 s) (5 - 7 s)

\(=\)

i - i i^{i}

[Note: Insert constant first and then term with variable. While entering terms, coefficient with sign is followed by the variable.]

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3. Expand the expression