Question

factorise 25 x square + 4 y square + 9 z square - 20 x square - 12 by X + 30 x z​

Answer 1

Answer:

(ii) 25x2 + 4y2 + 9z2 – 20xy + 12yz – 30xz

= (5x)2 + (-2y)2 + (-3z)2 + 2(5x)(-2y) + 2(-2y)(-3z) + 2(-3z)(5x)

= (5x – 2y – 3z)2

Step-by-step explanation:

(5x)

2

+(2y)

2

+(3z)

2

−2(5x)(2y)+2(2y)(3z)−2(3z)(5x)

=(5x−2y−3z)

2

Only x is negative.

=(−(−5x+2y+3z))

2

Or =(5x−2y−3z)

2