Question

what is the technique to solve this

Answer 1

I hope it helps you
I hope you understand

Answer 2

For these kind of questions you need to split the middle term. the two numbers that you split should be in such a way that their sum is the coefficient of y (that is 27 in this polynomial) and their product should be equal to the constant (that is 18 in this polynomial) but if there is a coefficient for y², then their product should be equal to the product of the coefficient of y² and the constant (like the product of the numbers that are split should be equal to 10*18 in this polynomial)