Example

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

Question

$$( 9 x + 4 y + 5 z ) ^ { 2 }$$

Expand

$81x^{2}+72xy+90xz+16y^{2}+40yz+25z^{2}$

Evaluate

$\left(9x+4y+5z\right)^{2}$

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