Simplify the given expression.
(–3x2 – 9x + 17) – (15x2 + 20x – 4)

Step-by-step explanation:

We need to group terms according to the power of the variable x

So the math operation here is this:

Wich can not be simplified much longer

For this case we must simplify the following expression:

We must bear in mind that by law of signs of multiplication it is fulfilled that:

Then, rewriting:

We add similar terms:

We have that equal signs are added and the same sign is placed, while different signs are subtracted and the sign of the major is placed, then:

the k side

step-by-step explanation:

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