Quadratic functions g and k are showed below
g (x)=5x^2-12
k (x)=5x^2+c
for what value of c will the graph of k be 9 units above the graph of g?

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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