Phân tích đa thức thành nhân tử. 7x^2+35x+42=square

The task is to factorize the given polynomial. Factoring polynomials is a fundamental skill in algebra. It involves breaking down a polynomial into simpler components, which when multiplied together, give the original polynomial. The given polynomial is . This is a quadratic polynomial and can be factored by grouping terms and taking out common factors.