Question

pls answer me I have test ​

Answer 1

6) a) its 3x^2-4x+3x-4
x(3x-4)+1(3x-4)
(x+1)(3x-4)

Answer 2

Answer:

6.(a)

$3x^{2} - x - 4\\= 3x^{2} + 3x - 4x - 4\\= 3x(x + 1) - 4(x + 1)\\= ( 3x - 4) ( x + 1 )$

(b)

64m³ - 343n³

= (4m)³ - (7n)³

a³ - b³ =( a - b)(a² + ab + b²)

= (4m - 7n) {(4m)² + (4m)(7n) + (7n)² }

= (4m - 7n) {16m² + 28mn + 49n²}

7. (a)

x³ - 3x² - 9x - 5

= x³ + x² - 4x² - 4x - 5x - 5

= x²( x + 1) - 4x ( x + 1) - 5(x + 1)

= (x + 1)(x² - 4x - 5)

= (x + 1)(x² -5x + x - 5)

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

(b)

64a³ - 27b³

= (4a)³ - (3b)³

a³ - b³ =( a - b)(a² + ab + b²)

= (4a - 3b) {(4a)² + (4a)(3b) + (3b)² }

= (4a - 3b) {16a² + 12ab + 9b²}