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6-4b-3b^{2}
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6-4b-3b^{2}
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6-4b\left(2b+1\right)+5b^{2}
Multiply -1 and 4 to get -4.
6-8b^{2}-4b+5b^{2}
Use the distributive property to multiply -4b by 2b+1.
6-3b^{2}-4b
Combine -8b^{2} and 5b^{2} to get -3b^{2}.
6-4b\left(2b+1\right)+5b^{2}
Multiply -1 and 4 to get -4.
6-8b^{2}-4b+5b^{2}
Use the distributive property to multiply -4b by 2b+1.
6-3b^{2}-4b
Combine -8b^{2} and 5b^{2} to get -3b^{2}.
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