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\left(-2a+4\right)\left(2a+1\right)
Use the distributive property to multiply -2 by a-2.
-4a^{2}-2a+8a+4
Apply the distributive property by multiplying each term of -2a+4 by each term of 2a+1.
-4a^{2}+6a+4
Combine -2a and 8a to get 6a.
\left(-2a+4\right)\left(2a+1\right)
Use the distributive property to multiply -2 by a-2.
-4a^{2}-2a+8a+4
Apply the distributive property by multiplying each term of -2a+4 by each term of 2a+1.
-4a^{2}+6a+4
Combine -2a and 8a to get 6a.