Question

Hello.. Please solve these Q2 and Q3.. chapter-Algebraic Expressions. ....Solve with explanations please..​

Answer 1

Answer:

Here is your answer

Step-by-step explanation:

2i) 3x+-5x+7x ( minus of plus is minus)

3x-5x+7x=5x (-5x+3x is -2x +7x is 5x)

2ii) 7xy+2xy+-8xy=9xy-8xy is 1xy

2iii) -2ab+3ab+ab=2ab (-2ab+3ab is 1ab+about is 2ab)

2iv) 3mn-5mn+8mn+-4mn=2mn (3mn-5mnis -2mn+8mn is 6mn-4mn=2mn)

2v) 2x^3+3x^3+-4x^3+-5x^3= -4x^3 (2x^3+3x^3 is 5x^3-4x^3 is 1x^3-5x^3=4x^3

3i)21ab-32+7b-20b=(group the like terms)=8b-32

3ii) 12m^2-9m+5m-4m^2-7m+10=12m^2-4m^2-9m+5m-7m=8m^2-11m

3iii )-z^2+13z^2-5z+7z^3-15z =12x^2-20z+7z^3

3iv)5x^2y-5x^2+3yx^2-3y^2+x^2-y^2+8xy^2-3y^2=5x^2y-4x^2-7y^2+3yx^2

3v)p-(p-q)-(q-p)-q=p-(p-q)-q+p

p-p+q-q+p=p -q (change the signs before opening the brackets in the case of subtraction)

Hope it helps you

Answer 2

I hope it is useful for you

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