Tom N. answered 06/20/19
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f'(t) =2t-6 so the slope is m= 2•2-6= -2 the tangent line can be found using the straight line equation y=mx+b. In so doing -3 = -2•2 +b and b= -3 +4 =1 so the tangent line at (2,-3) is f(t) = -2t+ 1