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3 years ago

12

F(x)=2x-3 for x =2a.-7b.-1c.1d.4

1 answer:

ELEN [110]3 years ago

4 0

The answer is c. Because insert x=2 into the equation and 2x2=4-3=1 sooo f(x)=1

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$\dfrac{3+2i}{4+i}=\dfrac{3+2i}{4+i}\cdot\dfrac{4-i}{4-i}=\dfrac{(3+2i)(4-i)}{4^2-i^2}\\\\=\dfrac{(3)(4)+(3)(-i)+(2i)(4)+(2i)(-i)}{16-(-1)}=\dfrac{12-3i+8i-2i^2}{16+1}\\\\=\dfrac{12+5i-2(-1)}{17}=\dfrac{12+5i+2}{17}=\dfrac{14+5i}{17}=\dfrac{14}{17}+\dfrac{5}{17}i$

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