book Maths Puzzle Numerical Ability

x² + 6x - 3 = 0

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book Other Question

A line with a slope of 1/2 is drawn thru point P at (-2,,2). Moving from left to right, what is the next ordered pair of whole numbers on the line?

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How does one figure out this answer?
what is the amplitude, period, phase shift, and vertical displacement for
y= (square root 7)cos[5(x-85 degrees)] - 1.2