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What is the value of the expression, 9x² - 12x + 4, when x = 3?

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If x = 1, y = 3, and z = 2, what is the value of the expression 4xy + 3xz+ 7y?

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What is the value of the expression (x + y)² + z, when x = 7, y = 8 and z = 9?

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Rewrite the expression by combining like terms.
5x² + 5y + 2x² + 4y² – 4x² + 2y² - 4y

• 3x² + 3xy + 6y
• 6y² + 2xy + 2x
• 7x² + 35x
• 3x² + 6y² + y

Expand and simplify $3ab^2\left(4-ab+a^2\right)$  

•  $12ab^2-3a^2b^3+3a^3b^2$  

•  $7ab^2-3ab^2+3a^2b^2$  

•  $12ab^2+3a^2b^3+3a^3b^2$  

•  $12ab^2-3ab+3a^2$  

Expand and simplify $2x\left(x+3y\right)-y\left(2x-4y\right)$  

•  $2x^2+6xy+4y^2$  

•  $2x^2+4xy+4y^2$  

•  $2x^2+2xy-4y^2$  

•  $2x^2-4xy+4y^2$  

Solve for x:
5 + 3x = 8x - 15

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• 20/11

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Solve:
2(2x + 3) = -6(x + 9)

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• -6
• 7.5

Solve:

 $\frac{3x}{5}=\ 6$   

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