Solve the following system of equations in real $a,\,b,\,c,\,d$:
$a+b=9$
$ab+c+d=29$
$ad+bc=39$
$cd=18$
Heuristic solution:
Showing posts with label b. Show all posts
Showing posts with label b. Show all posts
Analysis for Quiz 12: Brain Power Enrichment Quiz (I)
Analysis for Quiz 12: Brain Power Enrichment Quiz (I)
Question 1: If $a\gt b$ and $c\gt d$ are true, then we can say $a+c\gt b+d$ is always true.
A. Correct.
B. Incorrect.
Answer:
Yes, that is always correct, regardless if $a,\,b,\,c,\,d$ are negative or positive real number.
Take for example, we have:
Question 1: If $a\gt b$ and $c\gt d$ are true, then we can say $a+c\gt b+d$ is always true.
A. Correct.
B. Incorrect.
Answer:
Yes, that is always correct, regardless if $a,\,b,\,c,\,d$ are negative or positive real number.
Take for example, we have:
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