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49a^{2}
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49a^{2}
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\left(-7\right)^{2}a^{2}
Expand \left(-7a\right)^{2}.
49a^{2}
Calculate -7 to the power of 2 and get 49.
\left(-7\right)^{2}a^{2}
Expand \left(-7a\right)^{2}.
49a^{2}
Calculate -7 to the power of 2 and get 49.
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