1 Marks Question

Question 11 Mark

Write $‘T$ for true and $‘F’$ for false for the following:
The coefficient of $x$ in $x^2-3 x+5$ is 3 .

Answer

False.
The coefficient of $x$ in $-3$

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Question 21 Mark

Write the coefficient of $x$ in of the following:
$-\frac{3}{2}\text{abx}$

Answer

Co-efficient of $x$ in the given numbers are:
$-\frac{3}{2}\text{ab}$

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Question 31 Mark

Write the coefficient of $x$ in of the following: $-5xy$

Answer

Co-efficient of $x$ in the given numbers are: $-5y$

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Question 41 Mark

Fill in the blank. $(a + 2b - 3c)$ is a _____.

Answer

$(a + 2b - 3c)$ is a trinomial.

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Question 51 Mark

Write $‘T$ for true and $‘F’$ for false for the following:
$(3 x+5 y)(3 x-5 y)=\left(9 x^2-25 y^2\right)$.

Answer

True.
$\text { LHS }=(3 x+5 y)(3 x-5 y)$
$=3 x(3 x-5 y)+5 y(3 x-5 y)$
$=9 x^2-15 x y+15 x y-25 y^2$
$=9 x^2-25 y^2$
$\text { L.H.S }=\text { R.H.S. }$

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Question 61 Mark

Fill in the blank.
$\left(a^2-2 b^2\right)$ is a _____.

Answer

$\left(a^2-2 b^2\right)$ is a $\underline {binomial}$.

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Question 71 Mark

Write $‘T$ for true and $‘F’$ for false for the following:
If a = 2 and $\text{b}=\frac{1}{2}$, then the value of ab $\left(a^2+b^2\right)$ is $4\frac{1}{4}$

Answer

True.
$(\text{a}^2+\text{b}^2)$
$=\Big[2^2+\Big(\frac{1}{2}\Big)^2\Big]$
$=4+\frac{1}{4}$
$=4\frac{1}{4}$

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Question 81 Mark

Write $‘T$ for true and $‘F’$ for false for the following:
$(5x - 7) - (3x - 5) = 2x - 12.$

Answer

False.
$LHS = (5x - 7) - (3x - 5) = 5x - 7 - 3x + 5 = 2x - 2.$
$LHS = RHS$

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Question 91 Mark

Fill in the blank. In $x^2+2 x-5$, the _______ term is $-5.$

Answer

In $x^2+2 x-5$, the $\underline {constant}$ term is $-5.$