The graphs of f:x=2(x-1)(x-1)-18 and g:x=mx+k is given. Find the coordinates of a,b,c,d(the turning point) and E if CE is parallel to AB. How can I solve this?

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There is an online computation service that allows you to enter formulas to obtain the answer. In many cases, the service provides the user with information and step by step solving details.

Another solution is to use MathWay, because it allows you to choose the domain of mathematics where the equation belongs to: https://mathway.com/

Access Wolfram Alpha and enter the formula: http://www.wolframalpha.com/

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