How do you combine like terms in $9- 4( - a + 9) + 3( 7- 2a)$ ?

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Answer 1 · 2017-04-17T04:49:20

$-2a-6$

Expand through the brackets,

$9+4a-36+21-6a$

Combine like terms,

$9+21-36=-6$

$4a-6a=-2a$

Combine for the final answer,

$-2a-6$ or $-2(a+3)$

How do you combine like terms in 9- 4( - a + 9) + 3( 7- 2a)9- 4( - a + 9) + 3( 7- 2a)?