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3 years ago

Multiply and simplify: 3a(4a2 – 5a + 12) 7a3 – 2a2 + 15a 12a3 – 15a2 + 36a 12a2 – 15a + 36 7a2 – 2a + 15

Mathematics

1 answer:

Luden [163]3 years ago

3 0

3a • (4a2 - 5a + 12)

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X = longest side , y = middle side , z = shortest side

P = x + y + z
P = 82
x = 2z + 7
y = z + 15

82 = (2z + 7) + (z + 15) + z...combine like terms
82 = 4z + 22
82 - 22 = 4z
60 = 4z
60/4 = z
15 = z

so the shortest side (z) is 15 cm
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Combine like terms

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