Solve the quadratic equation. Simplify if possible:
-5 (x + 3) 2 = -80
1 answer:
Answer:
Step-by-step explanation:
(x +y)² = x² + 2xy +y²
-5(x + 3)² = -80
-5(x² + 2*x*3 + 3²) = -80
-5(x² + 6x + 9) = -80
Divide the equation by (-5)
x² + 6x +9 = -80/-5
x² + 6x + 9 = 16
x² + 6x + 9 - 16 = 0
x² + 6x - 7 = 0
x² - x + 7x - 7 = 0
x(x - 1) + 7(x - 1) = 0
(x - 1)(x + 7) = 0
x -1 = 0 ; x + 7 = 0
x = 1 ; x = -7
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Divide 2012 by 360: 5.588888....
This means "5 full revolutions" plus 0.5888... of a revolution."
(0.5888 ... )*(360 degrees) = 212 degrees (answer)
Answer:
Step-by-step explanation:
4x+2=5x-6
4x-5x=-6-2
-x=-8
therefore, x=8
75:125
divide both sides by 25
75/25= 3
125/25= 5
Answer: 3:5
