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Gelneren [198K]
3 years ago
15

X2+(-x)+(-3x2)+(-5x)+12

Mathematics
1 answer:
mrs_skeptik [129]3 years ago
7 0
2(4-3x) is the answer to X2+(-x)+(-3x2)+(-5x)+12
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Answer:

55 ft... The ladder must extend 55ft

Step-by-step explanation:

c =  \sqrt{a ^{2} + b ^{2}  } \\   =  \sqrt{33 ^{2} + 44 ^{2}  }  \\  =  \sqrt{1089 + 1936 }  \\  =  \sqrt{3025}  \\ c = 55

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5 0
3 years ago
How to solve it and why
RideAnS [48]
6.

4x^2 + 4 = 0

Divide both sides by 4

x^2 + 1 = 0

Use the quadratic formula since this cannot be factored.

x = (-b +- sqrt(b^2 - 4ac))/(2a)

x = +- sqrt(-4(1)(1))/2

x = +- sqrt(-4)/2

x = +- 2i/2

x = +- i

x = i or x = -i

Quicker solution:

If you have x^2 = number, then

x = +- sqrt(number)

Once you get to

x^2 + 1 = 0

Subtract 1 from both sides

x^2 = -1

Apply the quick method

x = +- sqrt(-1)

x = +- i

8.

2x^2 + 50 = 0

Divide both sides by 2

x^2 + 25 = 0

Subtract 25 from both sides

x^2 = -25

Apply quick method

x = +- sqrt(25)

x = +- 5i

x = 5i or x = -5i
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