book Maths Puzzle Numerical Ability

I want to solve the equation:
0.95 = exp(-a)+aexp(-a) = exp(-a)(1+a)

The first step I guess would be to take the natural log:
ln(0.95) = ln(1+a)-a

Please help!
Matt

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book Other Question

Find the polynomial f(x) of degree 3 such that 1, -1 and 2 are zeroes of the polynomial with the leading coefficient of 2 8/3p+5/4p+9/2p

1/x+3-1/x/1/x

2x^2+2=5x

x^2-4x-1=0

x^2-3x-4is greater than or equal to 0

the absolute value of x+3 = absolute value of 2x

y=3/2x-4

y=-2x+1