Choose the correct answer — task. Mathematics State Board, Class 7.

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Choose the right identity:

If the expression is \(r^2 + 19r + 48\), the which identity will you use to find its factors?

\((a + b)(a - b) = a^2 - b^2\)
\((x + a)(x + b) = x^2 + x(a + b) + ab\)
\((a - b)^2 = a^2 - 2ab + b^2\)
\((a + b)^2 = a^2 + 2ab + b^2\)

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