Abridged multiplication formulas (decimal fractions) — task. Mathematics CBSE, Class 7.

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Solve the equation:

f^{2} + 1.4 f + 0.49 - 0.04 f^{2} = 0

\begin{array}{l} f_{1} = i \\ f_{2} = i \end{array}

Write down the answer with its sign. Write decimal fractions with two digits after point, if necessary.

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19. Abridged multiplication formulas (decimal fractions)