Question

with solutions plzzzzzzz........​

Answer 1

$\Large{\underbrace{\sf{\orange{Required\:Solution:}}}}$

Here, in Que.5 We have to subtract x²y - 4xy² + 4xy from 2x²y + 3xy² - xy.

To do so,

• Convert this statement into mathematical expression.

:$\implies{\sf{(2x^{2}y+3xy^{2} - xy)-(x^{2}y-4xy^{2} + 4xy)}}$

• Open the brackets and multiply the (-) sign with the 2nd expression.

:$\implies{\sf{2x^{2}y+3xy^{2} - xy -x^{2}y + 4xy^{2} - 4xy}}$

• Arrange the terms according their variables and exponents along with sign.

:$\implies{\sf{2x^{2}y - x^{2}y +3xy^{2} + 4xy^{2} -xy - 4xy}}$

• Simplify this.

:$\large\implies{\boxed{\sf{\orange{x^{2}y +7xy^{2} -5xy}}}}$

Hence, the answer is x²y + 7xy² - 5xy.

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In Que. 6 we have to find the values of equation if a = 3 and b = 1.

(a) 3a + b

• Substitute the values i.e., a = 3 and b = 1 and simplify.

:$\implies{\sf{3(3)+1}}$

:$\implies{\sf{9+1}}$

:$\large\implies{\boxed{\sf{\orange{10}}}}$

(b) a² + 2b² - 4

• Substitute the values i.e., a = 3 and b = 1 and simplify.

:$\implies{\sf{(3)^{2}+2(1)^{2} - 4}}$

:$\implies{\sf{9 + 2\times1 - 4}}$

:$\implies{\sf{9+2-4}}$

:$\implies{\sf{11-4}}$

:$\large\implies{\boxed{\sf{\orange{7}}}}$

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