exam Maths Puzzle Numerical Ability

Please help with factoring the polynomial 405x^8+90x^7y+5x^6y^2

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exam Other Question

x to the power of 2 + 24x + 48 Find the center of the circle with equation x^2+2x+y^2-10y+22=0. I plotted it to be (-2.4) but not sure if it is right. Thanks for checking it.