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