exam Maths Puzzle Numerical Ability

How would I solve this using quadratic formula?

f(x) = x^2 + 4

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exam Other Question

7. Write the equation of the line passing through each of the given pairs of points. Write your results in slope-intercept form, where possible

(-5, 3) and (4, 1) GRAPH:a line with a slope of 2 and a y-intercept of 3.