book Maths Puzzle Numerical Ability

Can you explain how to solve 8x^2-6x-9=0?

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book Other Question

I need your help ..............

1. Expand (s-u)^5.

2. Evaluate 10!

3. Find the fifth term in the expansion of (e+2f)^8.

4. Use Pascal's triangle to expand the binomil ( I need more help on these please. you solvers are great!
Can you solvers also tell me if these problems are POLYNOMIALS, LINEAR, PARABOLA, TRINOMIALS, BINOMIALS, QUADRATIC EQUATI