exam Maths Puzzle Numerical Ability

Subtract, using the vertical method.
7x^2 + 6x from 9x^2 -3

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exam Other Question

Please help factor, thanks for all the help!

24x^4+7x^2-5
Use Gauss-Jordan elimination method to solve

2x-5y+5z=17
x-2y+3z=9
-x+3y=-4

I NEED HELP KNOWING HOW TO USE THIS METHOD