Answer
$x^2+8x+15$
Work Step by Step
Use FOIL method.
$(x+3)(x+5)=x\cdot x+x\cdot 5+3\cdot x+3\cdot 5$
Simplify.
$=x^2+5 x+3x+15$
Combine like terms.
$=x^2+8x+15$
Hence, the single polynomial answer in standard form is $x^2+8x+15$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Appendix A - Review - A.3 Polynomials - A.3 Assess Your Understanding - Page A30: 46
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