Sagot :
1. Area of a rectangle is equal to L × W
A = L × W
A = (x+5) (x-5)
x (x-5) = x² - 5x + 5 (x-5) = 5x - 25
x² - 5x + 5x - 25
A = x² - 25
2. Area of a square is equal to s².
A = s²
A = (3x+4)²
3x (3x+4) = 9x² + 12x
4 (3x+4) = 12x + 16
9x² + 12x + 12x + 16
A = 9x² + 24x + 16
3. Area of a rectangle is equal to L × W
A = L × W
(3x²+7x-6) ÷ (x + 3)
L = 3x - 2
4. Speed is equal to distance/time.
s = d/t
s = (2y³ - 7y² + 5y - 1) km
(2y - 1) hour
s = y² - 3y + 1 km/hour
5. [(m+3) + (2m-3)] (m²+2m-2)
(m+3) + (2m-3)
4m + (-1m) = 3m
3m (m²+2m-2)
3m³ + 6m² - 6m
Good luck with your studies!