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Algebra
If x(a) = a^2+2a-1, then x(8)-x(5) =
a. 43
b. 45
c. 14
d. 3
Read Solution (Total 18)
-
- sorry its 45
x(a) = a^2+2a-1
x(8) = 8^2 + 2(8) -1
=>64 + 16 - 1 = 79
x(5) = 5^2 + 2(5) -1
=> 25 + 10 - 1 = 34
x(8) - x(5) = 79 - 34 = 45
Ans : 45
- 10 years agoHelpfull: Yes(16) No(2)
- 45
x(8)-x(5) =79-34=45 - 10 years agoHelpfull: Yes(4) No(1)
- x(8)-x(5)=64+16-1-(25+10-1)=45
- 10 years agoHelpfull: Yes(2) No(1)
- x(8) = 64 + 16 - 1 = 79
x(5) = 25 + 10 - 1 = 34
79 - 34 = 45
ans>>>>>>>45 - 10 years agoHelpfull: Yes(1) No(1)
- x(a) = a^2+2a-1 ----(1)
put a=8 in equ (1) we get , x(8) = 8^2+2(8)-1 =79
put a=5 in equ (1) we get , x(5) = 5^2+2(5)-1 =34
x(8)-x(5) = 79-34= 45
ANSWER : OPTION : b. 45
- 10 years agoHelpfull: Yes(1) No(0)
- answer is 45
- 10 years agoHelpfull: Yes(1) No(0)
- x(a) = a^2+2a-1
x(8) = 8^2 + 2(8) -1
=>64 + 16 - 1 = 47
x(5) = 5^2 + 2(5) -1
=> 25 + 10 - 1 = 14
x(8) - x(5) = 47 - 14 = 33
Ans : 33 - 10 years agoHelpfull: Yes(0) No(15)
- b.45
x(8)=8^2+2*8-1 x(5)=5^2+2*5-1
=64+16-1 =25+10-1
=64+15 =25+9
=79 =34
=x(8)-x(5)
=79-34
=45 - 10 years agoHelpfull: Yes(0) No(1)
- x(8)-x(5)=45
- 10 years agoHelpfull: Yes(0) No(1)
- its 45
x(8)=(8)^2+2(8)-1=79
x(5)=(5)^2+2(5)-1=34
x(8)-x(5)=79-34=45
- 10 years agoHelpfull: Yes(0) No(1)
- 8^2+2(8)-1 - 5^2+2(5)-1
=(64+16-1) - (25+10-1)
=79 - 34
=40 - 10 years agoHelpfull: Yes(0) No(4)
- 45
x(8)=79
x(5)=34
ans is minus of two above
- 10 years agoHelpfull: Yes(0) No(1)
- answr b
8^2+2(8)-1-5^2-2(5)+1=45 - 10 years agoHelpfull: Yes(0) No(0)
- 45
x(a) = a^2+2a-1
x(8) = 8^2 + 2(8) -1
=>64 + 16 - 1 = 79
x(5) = 5^2 + 2(5) -1
=> 25 + 10 - 1 = 34
x(8) - x(5) = 79 - 34 = 45
- 10 years agoHelpfull: Yes(0) No(0)
- given that x(a)=a^2+2a-1
so
x(8)=64+16-1=79
x(5)=25+10-1=34
x(8)-x(5)=79-34=45
option a)45 is the ans - 10 years agoHelpfull: Yes(0) No(0)
- ans is b. 45
- 9 years agoHelpfull: Yes(0) No(0)
- x(8)=79
x(5)=34
so 79-34=45 - 7 years agoHelpfull: Yes(0) No(0)
- x(8)=79
x(5)=34
79-34=45 - 7 years agoHelpfull: Yes(0) No(0)
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