7(a + 3) = 7*a + 7*3 = 7a + 21
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3(7a - 5b) + 2(4a - 3b) Multiply the contents of each bracket by the number outside it: 21a - 15b + 8a - 6b Bring like terms together: 21a + 8a - 15b - 6b Combine like terms: 29a - 21b This cannot be simplified further.
x(x-1)(x-1)FOIL SIMPLIFY TIMES EVERYTHING IN THE BRACKETS BY X i will let you work it out
7C MINUS bracket open c plus 2 bracket close equals 7c minus c minus 2 equals 6c minus 2
-(3x-4) = -3x + 4
sounds like 21: (7 x 2) is 14, plus 7 is 21