book Maths Puzzle Numerical Ability

Find the domain of

y = 5x2 – 14x – 10

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book Other Question

I need your help on this one.................Choose the equation of the parabola that opens to the right, has the vertex
(-3,4) and goes through the points (5,-4).
a. (y+4)^2=4 Find a linear function that passes throught the point (-3, 8) and is perpendicular to 2x - 5y = 8.