Answer:
2nd option
Step-by-step explanation:
(5x² - 4x - 1) - (- 4x² - 4)
remove first set of parenthesis and distribute second set by - 1
= 5x² - 4x - 1 + 4x² + 4 ← collect like terms
= 9x² - 4x + 3
by pythagorean formula, the last side is √(61)
by cos rule
cos A
A = 39.81
A = l*w
A= 7*8
A= 56
56 is the area