Download App

Number systems — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsNumber systems1 Mark
MCQ
$(-2-\sqrt{3})(-2+\sqrt{3})$ when simplified is:
  • A
    Positive and irrational.
  • B
    Negative and irrational.
  • C
    Negative and rational.
  • ✓
    Positive and rational.
✓

Answer

Correct option: D.
Positive and rational.
$(-2-\sqrt{3})(-2+\sqrt{3})$$=(-2)^2-(\sqrt{3})^2$
$=4-3$
$=1$
Positive and rational

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q" from Number systems→Number systems — all question types→Maths STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

AB and CD are two parallel lines. PQ cuts AB and CD at E and F respectively. EL is the bisector of $\angle F E B$. If $\angle L E B=35^{\circ}$, then $\angle C F Q$ will be
→
The value of $x^{p-q} x^{q-r} x^{r-p}$ is equal to:
→
If $a + b + c = 9$ and $ab + bc + ca =23,$ then $a^3+ b^3+ c^3 - 3abc =$
→
The area of the curved surface of a cone of radius $2r$ and slant height $\frac{\text{l}}{2},$ is:
→
If a diagonal AC and BD of a quadrilateral ABCD bisect each other, then ABCD is a
→
A solid has $..........$ dimensions.
→
Pythagoras was a student of
→
The perpendicular distance of the point P (4, 3) from x-axis is
→
Which of the following statements is true?
→
If $x+1$ is a factor of the polynomial $2 x^2+k x$, then $k=$
→