Solve for k
k=6
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16-4\left(-1\right)\left(-k+2\right)=0
Calculate -4 to the power of 2 and get 16.
16-\left(-4\left(-k+2\right)\right)=0
Multiply 4 and -1 to get -4.
16+4\left(-k+2\right)=0
The opposite of -4\left(-k+2\right) is 4\left(-k+2\right).
16+4\left(-k\right)+8=0
Use the distributive property to multiply 4 by -k+2.
24+4\left(-k\right)=0
Add 16 and 8 to get 24.
4\left(-k\right)=-24
Subtract 24 from both sides. Anything subtracted from zero gives its negation.
-k=\frac{-24}{4}
Divide both sides by 4.
-k=-6
Divide -24 by 4 to get -6.
k=6
Multiply both sides by -1.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
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Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}