value
Algebra
Level
3
If 2a^3+a^2+5b+3=43 And 4a+b=12 Then, what is the value of a+b ?
The answer is 6.
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1 solution
Just substitute the value of 'b' from 4a+b=12
b=12-4a
Now put this value in the given equation, you will get-
2a^3 +a^2 -20a +20= 0
Putting a=2, the equation is satisfied.
Now, b=12-4(2) =4
a+b= 2+4= 6