2a + 21 = 8a - 9
Add 9 to each side:
2a + 30 = 8a
Subtract 2a from each side:
30 = 6a
Divide each side by 6:
5 = a
2a+5a+9a = 16a
2a+54=38 2a=38-54 2a=-16 a=-16/2 a=-8
a=5
2a+5a=3 7a=3 a=3/7 or .4286
y = x2 + 14x + 21 a = 1, b = 14 x = -b/2a = -14/2*1 = -7
a + a + a - 2a = 3a - 2a = a
depends what 'a' =
2a+5a+9a = 16a
a= (+a) or a= (-) b= 2a b= 2a c= (-a) c= (+a)
It is the expression 3 + 2a.
A equals 20.
1
2a + 3a + 4 = 5a + 4
A=2
a = 1
2a+54=38 2a=38-54 2a=-16 a=-16/2 a=-8
2a+12=8 2a=-4 a=-2 So a is -2.