exam Maths Puzzle Numerical Ability

solve using the square root property

2x^2-35=15

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exam Other Question

(x^4+7x^3+12x^2)/(x3+8x^2=15x) Sorry, I did not know where this one fits in at.
Divide: 7x^5y^5 - 21x^4y^4 + 14x^3y^3/7x^3y^3