Question

factorise by using suitable identity
1)81x³-225x⁵
2)48x-3x⁵​

Answer 1

Answer:

Step-by9x³(3+5x)(3-5x)

Step-by-step explanation:

81x³-225x⁵

9x³(9-25x²)

9x³[(3)²-(5x)²]

9x³(3+5x)(3-5x)

-step explanation:

Answer 2

Answer:

1.

x

2

+6xy+9y

2

=(x)

2

+2.x.3y+(3y)

2

=(x+3y)

2

∵(a+b)

2

=a

2

+2ab+b

2

=(x+3y)(x+3y)

2.

4x

2

y

2

−4xyz+z

2

=(2xy)

2

−2×2xyz+z

2

is of the form a

2

−2ab+b

2

=(a−b)

2

=(2xy−z)

2