Sum and difference of binomials (Decimal fractions) — task. Mathematics CBSE, Class 7.

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Find the sum and the difference of these binomials:

0.3 a^{2} + 0.02 b^{2}

and

0.17 a^{2} - 0.06 b^{2}

Choose the correct answer:

$\begin{array}{l} 0.43 a^{2} b^{2} \\ 0.21 a^{2} b^{2} \end{array}$
$\begin{array}{l} 0.32 a^{2} b^{2} + 0.11 a^{2} b^{2} \\ 0.32 a^{2} b^{2} - 0.11 a^{2} b^{2} \end{array}$
$\begin{array}{l} 0.47 a^{2} - 0.04 b^{2} \\ {0.13 a}^{2} - 0.04 b^{2} \end{array}$
$\begin{array}{l} 0.47 a^{2} - 0.04 b^{2} \\ 0.13 a^{2} + 0.08 b^{2} \end{array}$
$none of them$

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12. Sum and difference of binomials (Decimal fractions)