Question

factorise
4y^2+28y-120
​

Answer 1

Answer:

4(y^2+7y-30)

I think this will help

Answer 2

Answer:

${4y}^{2} + 28y - 120 \\ - 120 \times 4 = - 480\\ - 480 = 40 \times - 12 \\ 40 - 12 = 28 \\ = {4y}^{2} + 40y - 12y - 120 \\ = 4y(y + 10) - 12(y + 10) \\ = (y + 10)(4y - 12)$