Question

Factorise 4x^2+81y^2+z^2-36xy+18yz-4zx

Answer 1

Step-by-step explanation:

(a+b+c)^2 = a^2 + b^2 +c^2 + 2ab +2bc+2ac

(a+b+c)^2 = -2x^2 + 9y^2 + z^2 + 2×-2x×9y + 2×9y×z + 2×-2x×z

(-2x+9y+z)^2

Answer 2

Answer:

(2x+9y+z)^2 I think this is help you

Step-by-step explanation:

(x+y+z)^2=x^2+y^2+z^2+2xy+2yz+2zx