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Neporo4naja [7]
3 years ago
8

Oi can someone help me with this one ^{2}-12x-28=0 This is still pretty confusing for me

Mathematics
1 answer:
aleksley [76]3 years ago
5 0

Answer:

Both answers should be -2 and 14.

Step-by-step explanation:

Using the quadratic formula:

x^{2}-12x-28=0\\\\x=\frac{-(-12)+-\sqrt{(-12)^2-4(1)(-28)} }{2(1)}\\\\x= \frac{12+-\sqrt{144+112} }{2}\\\\x= \frac{12+-\sqrt{256} }{2}\\\\x= \frac{12+-16 }{2}\\\\x=6+-8

Therefore:

x_{1} =6+8=14\\x_{2}=6-8=-2

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Answer:

Width of T.V. is 21.94 inches Height is 39 inches and area is 855.66 square inch.

Step-by-step explanation:

When we buy an electronic item like T.V or Blue Ray aspect ratio is the term which is used by the salesmen or technicians. Aspect ratio is actually the ratio of length and breadth of the screen of a device or ration of width and height.

In this question aspect ratio of television is given as 16:9

This can be written as \frac{W}{H}=\frac{16}{9} or W=\frac{16}{9} H

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