12x - 4 = 7x - 21
12x -7x = -21 + 4
5x = -17
x = -3.4
19x
(7x + 8)(7x - 9)
12x - 28 = 7x - 63Subtract 7x from each side:5x - 28 = -63Add 28 to each side:5x = -35Divide each side by 5:x = -7
12x and then the squared. (the little two)
7(x - 1)(x + 3)
36 - 21 + 15 = 30 36 - 21 - 15 = 0
-12x-2Given: -5x-(7x+2)This is the same as -5x-1(7x+2). Use the distributive property and multiply the -1 through (7x+2).-5x-7x-2Simplify.-12x-2
19x
5x-8 + 7x 12x-8 12x = 8 x = 8/12 x= 2/3
(7x + 8)(7x - 9)
When factored it is: (7x+8)(7x-9)
It is: 12x
12x - 28 = 7x - 63Subtract 7x from each side:5x - 28 = -63Add 28 to each side:5x = -35Divide each side by 5:x = -7
12x and then the squared. (the little two)
7(x - 1)(x + 3)
6x2 + 7x = 56x2 + 7x - 5 = 0x =[ -7 ± √[72 - 4(6)(-5)] ]/2(6)x = [-7 ± √(49 + 120)]/12x = (-7 ± √ 169)/12x = (-7 ± 13)/12x = (-7 + 13)/12 or x = (-7 - 13)/12x = 6/12 = 1/2 orx = -20/12 = - 5/3
To simplify the expression (7x + 9 + 12x + 11 + 2y), first, combine the like terms. The terms with (x) are (7x) and (12x), which combine to (19x). The constant terms (9) and (11) combine to (20). Thus, the simplified expression is (19x + 20 + 2y).