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Delvig [45]
3 years ago
8

Please help me with this

Mathematics
1 answer:
kupik [55]3 years ago
3 0

Answer:

–x² + 12x + 5

Step-by-step explanation:

x² + 3x

–2x² + 9x + 5

The sum of the above expression can be obtained as follow:

.... x² + 3x

+ –2x² + 9x + 5

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

–x² + 12x + 5

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

Thus, the sum of x² + 3x and –2x² + 9x + 5 is –x² + 12x + 5

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Answer:

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Shtirlitz [24]

Equilateral triangle with the side 4 cm and h=2.5 cm

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2 years ago
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Scorpion4ik [409]
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Lostsunrise [7]

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Answer:

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Substitute for x in the first equation:

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