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49-36d^{2}
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49-36d^{2}
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7^{2}-\left(6d\right)^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
49-\left(6d\right)^{2}
Calculate 7 to the power of 2 and get 49.
49-6^{2}d^{2}
Expand \left(6d\right)^{2}.
49-36d^{2}
Calculate 6 to the power of 2 and get 36.
7^{2}-\left(6d\right)^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
49-\left(6d\right)^{2}
Calculate 7 to the power of 2 and get 49.
49-6^{2}d^{2}
Expand \left(6d\right)^{2}.
49-36d^{2}
Calculate 6 to the power of 2 and get 36.
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