Answer:
y = 5x² - 80x + 324
Explanation:
the quadratic function in standard form is
y = ax² + bx + c ( a ≠ 0 )
given
y = 5(x - 8)² + 4 ← expand the factor using FOIL
= 5(x² - 16x + 64) + 4 ← distribute parenthesis by 5
= 5x² - 80x + 320 + 4 ← collect like terms
= 5x² - 80x + 324 ← in standard form