Question

(iii) (x + 5) (x + 6) (x + 7)​

Answer 1

Answer:

(x + 5) (x + 6) (x + 7) = x³ + 13x² + 72x + 210

Step-by-step explanation:

(x + 5) (x + 6) (x + 7)

= x(x+6)+5(x+6)(x+7)

= (x²+6x+5x+30)(x+7)

= x²(x+7)+6x(x+7)+30(x+7)

= x³+7x²+6x²+42x+30x+210

= x³ + 13x² + 72x + 210