exam Maths Puzzle Numerical Ability

2x+5>1

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Please help me solve these problems.
Factor. Check by multiplying
4x^5 y^3+16x^3 y^2+32xy and
9x^2=72x and
factor by grouping
21x^3-15x^2+28x-20.
Thank you very much! slove algebraically log base 4 (x+41)- log base 4(2x-5)=2