book Maths Puzzle Numerical Ability

simplify the following algebraic expression

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

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book Other Question

I do not understand input-output tables. The directions say " Make an input-output table for the function. Use 0,1,2,and 3 as the domain" The first question says "y=3x+2" Please he what is 16X^2+9Y^2+64X+36Y-44 in standard form and graphed