exam Maths Puzzle Numerical Ability

Is this equation a linear equation?

3d - 4f = 8

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exam Other Question

solve the following equation by completeing the square

x2+3x=5 Hi! Could someone please help me with these problems. I need to simplify and all exponents should be positive.

4x^3*(3y)^4

(2^-1a^2b)^-3
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4a^-9

Thanks so much for your help!