-47
To factorise ( x^2 - 49 ), you can recognize it as a difference of squares. This expression can be rewritten as ( (x)^2 - (7)^2 ). Using the difference of squares formula, ( a^2 - b^2 = (a - b)(a + b) ), we factor it as ( (x - 7)(x + 7) ).
x2 + 6x = x*(x + 6)
38
4(x2 + 4)
( x - 14 ) ( x + 14 )
1(x2-1)
X2 + 4xx(x + 4)=======
To factorise ( x^2 - 49 ), you can recognize it as a difference of squares. This expression can be rewritten as ( (x)^2 - (7)^2 ). Using the difference of squares formula, ( a^2 - b^2 = (a - b)(a + b) ), we factor it as ( (x - 7)(x + 7) ).
x2 + 6x = x*(x + 6)
x2-196 = (x-14)(x+14) when factored
38
x(x+5)
4(x2 + 4)
( x - 14 ) ( x + 14 )
X(X2 - X)
x2 - 41 cannot be factorised.
x2 + 49 = 0 ∴ x2 = -49 ∴ x = 7i