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nikitadnepr [17]
3 years ago
11

What is the answer to (7*x+9)*x+90

Mathematics
1 answer:
Kaylis [27]3 years ago
5 0

Answer:

<h2>7x² + 9x + 90</h2>

Step-by-step explanation:

(7x + 9)x + 90               <em>use the distributive property </em><em>a(b + c) = ab + ac</em>

= (7x)(x) + (9)(x) + 90

=7x² + 9x + 90

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\left \{ \begin {array} {ccc|c|c}u_1+r&=&7&-4&-6\\4u_1+6r&=&12&1&1\\\end {array} \right.\\\\\\\left \{ \begin {array} {ccc}2r&=&-16\\-2u_1&=&-30\\\end {array} \right.\\\\\\\left \{ \begin {array} {ccc}r&=&-8\\u_1&=&15\\\end {array} \right.\\\\\\Proof:\\u_1=15\\u_2=7\\u_3=-1\\u_4=-9\\sum=12\\

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