exam Maths Puzzle Numerical Ability

I am stuck on correct answer for:

(x-5)(3x + 4)=0 is:

I am not using a specific book. I am just practicing...

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exam Other Question
Multiply

-3a^b/35a to the fifth power multiplied by 14a to the third power b^/-9b to the fourth power. Factor completely. b2 - ab - 6a2