exam Maths Puzzle Numerical Ability

What is the range of the function y=2(7)^(2x)-4? I think the answer is y is greater than 4 ???

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exam Other Question

Please help. Find the vertex and graph the quadratic function y =f(x)=6x^2-x-2

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The Length of a rectangle is 1 ft more than its width and 1 ft less than the length of a diagonal. Find the length of the diagonal in simplest radical form.