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Subjects
Mathematics State Board
Class 9
Algebra
Introduction to Arithmetic of polynomials
17.
Five mark exercise problems - II
Exercise condition:
5
m.
The
length
of a rectangle is \((3x + 2)\) units and its
breadth
is \((3x - 2)\) units. Find its area in terms of \(x\). What will be the area if \(x = 20\) units?
Answer
:
The area in terms of \(x =\)
\((9x^2 - 4) \ sq. \ units\)
\((9x^2 + 4) \ sq. \ units\)
\((9x - 4)^2 \ sq. \ units\)
\((9x + 4)^2 \ sq. \ units\)
The area if \(x = 20\) is
\(sq. \ units\)
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