Question

factorise the following using apprapreate identites 1, (-2x+5y-3x)power2​

Answer 1

Answer:

(−2x+5y−3z)

2

is of the form (a+b+c)

2

(a+b+c)

2

=a

2

+b

2

+c

2

+2ab+2bc+2ca

where a=−2x,b=5y,c=−3z

∴(−2x+5y−3z)

2

=(−2x)

2

+(5y)

2

+(−3z)

2

+2(−2x)(5y)+2(5y)(−3z)+2(−3z)(−2x)

=4x

2

+25y

2

+9z

2

−20xy−30yz+12zx