book Maths Puzzle Numerical Ability

How do you factor:
{{{15x^4-13x^2-20}}}

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book Other Question

When you double a number then add 20, you get four-thirds of the original number. Write an equation to represent this relationship. Use x for your variable. Help
RAtional Expression

3x^2-18x
________
-9x^2
-x^2/3x^2-18x/0+0
-0x^2
3x^2-18x
-0x^2
3x^2-18x