Question

please answer the circled question

Answer 1

Hey

Here is your answer,

1)= 9x^2+6x+1-25y^2

=(3x)^2+2*3x*1+(1)^2-(5y)^2

=(3x+1)^2-(5y)^2

={(3x+1)+5y}{(3x+1)-5y}

=(3x+5y+1)(3x-5y+1)


2)a2 + b2 + 2ab + 2bc + 2ca = (a2 + b2 + 2ab) + (2bc + 2ca)

= (a + b)2 + 2c ( b + a)

= (a + b) (a + b + 2c)

So, factors of (a2 + b2 + 2ab + 2bc + 2ca) are (a + b) (a + b + 2c).

3)estimating the value be 3

x = 3

x3 - 3x2 + 2x -6=0

(3*3*3) -3*3*3 +2*3 -6=0

27 - 27 +6 _6=0

hence the value of x is 3

Hope it helps you!