Question

x^3 + 30x =-13x^2 simplify
(1) x(x+5) (x+10)
(2) x(x+3)(x+10)
(3) x(x+21)(x+9)
(4) x(x+4) (x+7)​

Answer 1

Step-by-step explanation:

1. x(x+5)(x+10)

Using identity (x+a) (x+b) =x^2+x(a+b)+ab

x[(x)^2+(5+10)x+5×10]

x[x^2+15x+50]

x^3+15x^2+50x

2. x(x+3)(x+10)

x[x^2+13x+30]

x^3+13x^2+30x

3. x(x+21)(x+9)

x[x^2+30x+189]

x^3+30x^2+189x

4. x(x+4)(x+7)

x[x^2+11x+28]

x^3+11x^2+28x