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Basile [38]
3 years ago
12

(2a2 + ab + 2b) + (4a2 − 3ab + 9)

Mathematics
1 answer:
riadik2000 [5.3K]3 years ago
6 0
2a² + ab + 2b + 4a² - 3ab + 9

combine like terms:
2a² + 4a² + ab - 3ab + 2b + 9

6a² - 2ab + 2b + 9
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Solve the quadratic equation x2+8x−30=0 by completing the square.
diamong [38]

Answer:

               \bold{x=-4\pm\sqrt{46}}

Step-by-step explanation:

(a+b)^2=a^2+2ab+b^2\\\\\\x^2+8x-30=0\\\\\underbrace{x^2+2\cdot x\cdot 4+4^2}-4^2-30=0\\\\{}\qquad(x+4)^2\,-\,16-30=0\\\\{}\qquad\ \ (x+4)^2=46\\\\ {}\qquad\ \ x+4=\pm\sqrt{46}\\\\ {}\qquad\ \ x=-4\pm\sqrt{46}

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Slav-nsk [51]
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8 0
3 years ago
A x 4 = E
s2008m [1.1K]
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3 years ago
Which situation could be described by the expression m – 1.85?
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Step-by-step explanation:

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