SOLUTION: A rectangle of area 90 has a width 9 less than its length. What is the length and width of the triangle?

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Question 76049This question is from textbook Algebra 1 Expressions, Equations, and Applications
: A rectangle of area 90 has a width 9 less than its length. What is the length and width of the triangle? This question is from textbook Algebra 1 Expressions, Equations, and Applications

Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
X(X-9)=90
X^2-9X=90
X^2-9X-90=0
(X-15)(X+6)=0
X-15=0
X=15 ANSWER FOR THE LENGTH
15-9=6 FOR THE WIDTH
PROOF
15*6=90
90=90