y=(2×³−7)^4
[(2x)^{2}-7)]^{4}
Rewrite as (-7 + 4x^{2})^{4}
Let u = 4x^{2} - 7
[d/dx] [(4x^{2} - 7)]^{4} = [du^{4}/du]*[du/dx] where u = 4x^{2} - 7 and [d/du](u^{4}) = 4u^{3}
so that
[d/dx] [(4x^{2} - 7)]^{4} = 4(-7 + 4x^{2})^{3}{[d/dx](-7 + 4x^{2})}
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