Question

IT IS UPLOADED.. PLZ ANS ME IT IS FOR MATHS

Answer 1

Q. No. 1]

(a) There are 3 terms in the expression.

(b) The coefficient of $x$ in the term $\frac{-1}{2} xy^{2}$ is $\frac{-1}{2}$.

Q. No. 2]

Addition of  $ab + 2bc -ca+2ab-bc-ca$ by column method.

$ab + 2bc-ca\\2ab -bc - ca$

= 3ab - bc -2ca

Subtraction of $3ab - bc -2ca -4ab+5ab-3ca$ by column method.

$3ab - bc -2ca \\-4ab+5bc-3ca$

= -ab + 4bc - 5ca

Q. No. 3]

Sides of the rectangle = 4x + 7y and 3y - x

Area of the rectangle

= $lb$

= $4x +7y$ × $3y -x$

= $12xy + 21y^2 - 4x^2 - 7xy$

= $5 xy +21y^2-4x^2$

Q. No. 4]

To know the number, we need to subtract $5x^3-2x^2+3x+7$ from $7x^2 +7x-5$.

= $7x^2 +7x-5 - 5x^3-2x^2+3x+7$

= $-5x^3 +5x^2 + 10x + 2$

Q. No. 5]

Sum of $12ab-10b^2-18a^2$ and $9ab+12b^2+14a^2$

= $21ab + 2b^2-4a^2$

Sum of $ab+2b^2$ and $3b^2-a^2$

= $ab+5b^2-a^2$

Difference

= $ab+5b^2-a^2-21ab+2b^2-4a^2$

= $-20ab +7b^2-5a^2$

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