exam Maths Puzzle Numerical Ability

The process of writing a quadratic equation in the form (x + a)2nd power is called.

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This is a problem that I need to solve by system of elimination and then check the answer. The problem is:
{3a+2b=2}
{a+6b+18}
How do I solve this, and check the problem. Please help.

Thank You Please help me solve the equation. -4(x-9)=-8.

Thanks for all of your help!