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MATHS 2 Marks Questions

Algebraic Expressions · Gujarat Board (GSEB) STD 7 (GSEB - English Medium). 54 questions.

Questions · Page 2 of 2

2 Marks Questions

Question 512 Marks
Subtract:
$2 (ab + bc + ca)$ from $- ab - bc - ca$
Answer
We have,
$-ab - bc - ca - 2(ab + bc + ca)$
$= -ab - bc - ca - 2ab - 2bc - 2ca$
On combining the like terms.
$= -ab - 2ab - bc - 2bc - ca - 2ca$
$= -3ab - 3bc - 3ca$
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Question 522 Marks

Then find the value of:
Answer
Given,
$=\frac{1}{2}\Big(\frac{3}{2}\times2+7\Big)+(8-3) -3(2\times0+3)$ $=\frac{1}{2}(10)+5-3(3)$ $= 5 + 5 -9 =1$
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Question 532 Marks
Find the numerical coefficient of the terms:
$x3y2z, xy2z3, -3xy2z3, 5x3y2z, -7x2y2z2$
Answer
Numericla coefficient of, $x^3 y^2 z=1$
$x y^2 z^3=1$
$-3 x y^2 z^3=-3$
$5 x^3 y^2 z=5$
$-7 x^2 y^2 z^2=-7$
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Question 542 Marks
Subtract: $-4 x^2 y-y^3 \text { from } x^3+3 x y^2-x^2 y$
Answer
We have,
$x^3+3 x y^2-x^2 y-\left(-4 x^2 y-y^3\right)$
$=x^3+3 x y^2-x^2 y+4 x^2 y+y^3$
$=x^3+y^3+3 x^2 y+3 x y^2$
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2 Marks Questions - Page 2 - MATHS STD 7 Questions - Vidyadip