x2 + 10x + 21 = (x + 3)(x + 7)
273 13+8 = 21 and 13*21 = 273
n = 7. 3(7) + 7 = 28. 21+7=28
3x + 7 = -4x + 28 implies 7x + 7 = 28
7+(7*3) because 7*3=21 and 21+7=28, which is equal to 28, the product of 4*7.
It's 21.
The answer is 21 because if 21 is divided by 3 it equals 7 plus 4 equals 11.
7 plus 3 equals 10 or 7 times 3 equals 21
9a+21 3(3a+7)
x2 + 10x + 21 = (x + 3)(x + 7)
273 13+8 = 21 and 13*21 = 273
x=3 actually its 7
This doesn't make any math sense:2⁴ - 1 + 21 = 14 = 7 +3 x 5
(z=-3) and (z=7)
96
n = 7. 3(7) + 7 = 28. 21+7=28
3x + 7 = -4x + 28 implies 7x + 7 = 28