Question

find the error in this expressions​

Answer 1

a) (7a+35)/7 = 7a+5

the error is the coefficient 7 in the solution

the right answer is :

(7A+35)/7 = 7(a+5)/7

= a+5

b)4x^4 /4x^4 = 0

the error is that , any number divided by itself is 1 only.

the right answer is :

4x^4/4x^4 ,= 1

c)(2a+9)(2a-9) = 4a²+81 ,

the error is the (+) symbol in front of 81

the right answer is :

(2a+9)(2a-9) = 4a²-81

d) (2x+y)(2x+y)= 4x²+y²

the error is the wrong identity used here

the correct answer is :

(2x+y)(2x+y) = (2x+y)²

= 4x²+y²+4xy

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