exam Maths Puzzle Numerical Ability

5x^2+15x=40 in Completing the Square, Factoring, Square Root, Quadratic Formula, and Graphing. Thanks.

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exam Other Question

solve the equation show all work
x^2 - 3x = 10
x^2 - 3x + 10 = 0
x(x-3 + 10) = 0
I have no idea how to finish this problem Graph the muber on a number line. Then write two inequalitiez that compare the two numbers

18.-6 and 4