book Maths Puzzle Numerical Ability

3. Find the solution set the following equation. Check for extraneous solutions:

Square root of 7x - 8 = 2 square root of x + 1

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book Other Question

This is a graphing problem. I can graph the points of the y and x intercept if I could solve the equation using the intercept method. The problem says to graph the set of the fol express as a polynomial: ((x^2-xy)/(2x))*(2x+6y)=
i get x^2+2xy-3y^2