book Maths Puzzle Numerical Ability

Okay I need major help on this question. I need to apply the quadratic formula to this equation bx^2-cx+a^2=0 my problem is i don't know how to apply the formula with two square ro

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Please help again. I have no understanding of this at all. Thanks for all help.

3) The formula for calculating the amount of money returned for deposit money into a bank accou I am having trouble factoring the following problem {{{6x^3+13x^2+x-2}}}
I am also having trouble with how to solve {{{(36^(.75))^2}}}
Thank you so much in advance