book Maths Puzzle Numerical Ability

simplify the following algebraic expression

Multiply: (3x + 4) (3x -4)

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book Other Question

Solve the quadratic equation by factoring and applying the zero product principle.

12xsquare - 41x + 24 = 0

Thank you so much
Can someone help me solve this. Thank you in advance.
Use long division to reduce (6x^5 - 5x^4 - 6x^3 - 10x^2 + 21x - 9)/(2x - 3).