Question

2. Factor completely: 3x2 – 21x + 30

(Points : 1)
(x – 2)(x – 5)
(3x – 2)(x – 15)
2(x – 3)(x – 10)
3(x – 2)(x – 5)





Question 3. 3. Factor completely: 3x3 − 48x

(Points : 1)
x(x − 4)(x − 4)
3x(x − 16)
3x(x + 4)(x − 4)
3(x + 4)(x − 4)

Answer 1

start by looking at the answers

the last terms multiplied toghether must equal the last term in the equation

so in the first 1 option a: -2 x -5 = 10 so it cannot be the answer

the first terms multipled together must equal the fist term in th eequation

so again in the first option x *x = x^2 but in the equation you have 3x^2

Any that meet the above - just multiply them out to see if they come to the original