Answer
$s^2t^2-14st+49$
Work Step by Step
RECALL:
$(a-b)^2=a^2-2ab+b^2$
Use the formula above to have:
$(st-7)^2
\\=(st)^2-2(st)(7) + 7^2
\\=s^2t^2-14st+49$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 10 - Section 10.4 - Special Products - Exercise - Page 352: 21
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