need help due tomorrow

Plz me plz i will give a brain just plz

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?