exam Maths Puzzle Numerical Ability

how do i solve -6x(x+1)+4=16

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exam Other Question

Solve e^(8-9x)=8 in the form a ln 8 + b. We are looking for the coefficients a and b.

I am not understanding the form they are asking for. I have come up with x=ln8-8lne/-9lne
solve the system of equations by graphing
x-2y=10
x+2y=-2