book Maths Puzzle Numerical Ability

6r=10r-r-3r Please help me.

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book Other Question

Ok can you help me with this one?
"Use the discriminant to determine whether the vertex of the graph of the function 6x^2-2x+4 below lies above, below, or on the x-axis." I need to solve

square root x+5 = 8

would I get square root x -3