Factor the polynomial 4x4 - 20.x² – 3x² + 15 by grouping. What is the resulting expression?
O (4x² + 3)(x2-5)
O (4x2 – 3)(x2-5)
O (4x² - 5)(x² + 3)
O (4x² + 5)(x² – 3)

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

correct answer:

b.(19,-2)