exam Maths Puzzle Numerical Ability

4x - 5 (3x + 10) = 126
Please help with solving..need breakdown to solve other equations like this one. Thank you!

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exam Other Question

I have a question regarding Orseme's geometric graphical model?

the sum of 1/2 + 2/4 + 3/8 + ... + n/2^n + ... = 2.

I can't figure out how to prove this.
The degree three polynomial f(x) with real coefficients and leading coefficient 1, has 4 and 3 + i among its roots. Express f(x) as a product of linear and quadratic polynomials w