exam Maths Puzzle Numerical Ability

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exam Other Question

State which method should be applied as the first step for factoring the polynomial 6x^3+9x...

Factor completely...
1. 6b^4-18b^3-60b^2
2. 5a^2-125
3. y^3-12y^2+36y
4. b^2-ab-6a^2
5. 8m^4n-16mn^4 solve: square 4x-13=1