Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$(2 { x }^{ 2 } +9x+8)-(9 { x }^{ 2 } -6x+9)$$

Answer

$$-7*x^2+15*x-1$$

Solution


Remove parentheses.
\[2{x}^{2}+9x+8-9{x}^{2}+6x-9\]
Collect like terms.
\[(2{x}^{2}-9{x}^{2})+(9x+6x)+(8-9)\]
Simplify.
\[-7{x}^{2}+15x-1\]
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