book Maths Puzzle Numerical Ability

please help me solve this equation 8[(26+10)-4(3+2)]

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book Other Question

The directions say to use the quadratic formula to find the roots of the following polynomials:
a) 6x^2-6-5x
b) 6x^2-6x-5
but no matter how i solve it all my soloutions are inc Factorization of c^3-64.