book Maths Puzzle Numerical Ability

Solve by completing the square:

w^2 - 2w- 15 = 0


Solve
x^2 + 2x - 8 < or = to 0

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book Other Question

ln(x+1)=ln(3x+1) - lnx
solve exactly
y = 35 + 0.9x and y = 15 + 1.7x