exam Maths Puzzle Numerical Ability

Please find the real solutions if any of each equation. Use any method.

x^2+sqrt(2x)=1/2

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exam Other Question

Solve.
(x-4)(x+2)>or=0. Write answer in scientific notation. Solve the equation by finding all real roots.
x^3-7x+15x-9=0

i have this

1 -7 15 -9 /(divided by) 1.

x^2-6x+9
(x+1) (x^2-6x+9)
it says factor again and where is the soultion