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Naya [18.7K]
2 years ago
10

4(a2 + 2b) - 2b when a = 2 and b = –2.

Mathematics
1 answer:
SIZIF [17.4K]2 years ago
6 0

Answer:

4

Keys:

  • a \cdot (-b) = -a \cdot b
  • -\left(-a\right)=+a

Step-by-step explanation:

4\left(\left(2\right)\cdot \:2+2\left(-2\right)\right)-2\left(-2\right)\\\left(2\right)\cdot \:2+2\left(-2\right)\\=4+2\left(-2\right)\\=4-4\\=0

=4\cdot \:0-2\left(-2\right)\\4\cdot \:0\\=0\\=0-2\left(-2\right)

2\left(-2\right)\\=-4\\=0-\left(-4\right)

0-\left(-4\right)\\=0+4\\=4

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