Could Someone Simplify: 5(6x +7)?

6(-2a-4b) + 3(-7b-5a) = -(12(a+2b)+3(5a+7b)) = -3(4a+5a + 8b+7b)
 = -3(9a+15b) = -9(3a+5b)

-4b(2a-6b) + 5(7ab-2b²) = b(-8a+24b + 35a-10b) = b(27a+14b)

3(1-7x) - 4(-4+10x) = 3 - 21x +16 - 40x = 19-61x

7a - (-2b - 3(4a - (6b-4a))) = 7a - (-2b - 3(4a - 6b + 4a))
 = 7a - (-2b - 3(8a - 6b)) = 7a - (-2b - 24a + 18b) = 7a - (-24a + 16b)
 = 7a + 24a - 16b = 31a-16b

Your instructor may require the first two to be multiplied out. (The 1st and 4th problems in your list are duplicates.)

First & Last Simplified:
 
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6(-2a - 4b) + 3(-7b - 5a)
=> -12a - 24b - 21b - 15a
=> -12a - 15a - 21b - 24b
=> -27a - 45b
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7a - {-2b -3[4a - (6b - 4a)]}
=> 7a - {-2b - 3[4a - 6b +4a]}
=> 7a - {-2b - 12a + 18b - 12a}
=> 7a - {-2b + 18b - 12a - 12a}
=> 7a - {16b - 14a}
=> 7a - 16b + 14a
=> 21a - 16b
 
 

5(2a-6b)-3(5a+2b)

Ill help you out wit the first one...6(-2a - 4b) +3(-7b - 5a) ...-12a -24b -21b -15a...-27a -45b ...that's the answer...by the way is this your homework?