Question

20x square +30x-45
pls factorise

Answer 1

Answer:

3 or -3/4

Step-by-step explanation:

20x^2+30x-45=0

dividing both side by 5,

4x^2+6x-9=0

4x^2-12x+3x-9=0. •••(-36=-12×3 and 6=-12+3)

4x(x-3)+3(x-3)=0

(x-3)(4x+3)=0

x-3=0. or 4x+3=0

x=3. or 4x=-3

x=3. or x=-3/4

answer: x= 3 or -3/4