Answer:
13.8
Step-by-step explanation:
tan Q = <u>opposite </u> = <u>40</u>
adjacent x
Tan 71 = <u>40</u> x tan 71 = 40
<u> x tan 71</u> = <u> 40 </u>
tan 71 tan 71
x = <u> 40 </u> = 13.7731 = 13.8 (rounded to the nearest tenth)
tan 71
Al factorizar la expresión dada obtenemos que es igual a x²*(5 - x)*(5 + 5)
Por propiedad de los números reales: tenemos que para a y b dos números reales, se cumple que:
(a² - b²) = (a + b)*(a - b)
Por lo tanto como tenemos: - x⁴ + 25x², ordenamos:
- x⁴ + 25x² = (25*x² - x⁴ = ((5x)² - (x²)²)
Usando la propiedad dada inicialmente: obtenemos que:
((5x)² - (x²)²) = (5x - x²)*(5x + x²)
Sacamos de cada término un factor común "x":
x*(5 - x)*x*(5 + x) = x²*(5 - x)*(5 + 5)
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is the formula for calculating x1 and x2
To prove x1 + x2 = -b/a all we need to do is to express x1 and x2 from equation above
once we do we will get -2b/2a which is equal to -b/a because square root part will negate each other. one has + sign in front and other - sign
Showing that x1x2 = c/a goes similar way.
the numerator parts is actually difference of squares. after that we will have:
-b^2 -b^2 + 4ac = 4ac
in denominator we have 2a*2a = 4a^2
4ac/4aa = c/a
Answer: 4545
Step-by-step explanation:
Split the summation into smaller summations that fit the summation rules.