Question

4. Using the identity, (x + a)(x + b) = x2 + (a + b)x + ab, find the following products:
(ii) (3x + 4) (3x - 5)

plz explain step by step fast​

Answer 1

Answer:

hope that you could understand this.

Answer 2

$(3x + 4)(3x - 5) = {(3x)}^{2} + (4 + (- 5))3x + (4)( - 5) \\ = 9 {x}^{2} + ( - 1)3x + ( - 20) \\ = {9x}^{2} - 3x - 20 \\ =(3x - 15)(3x + 12) \\ = (x - 5)(x + 4) \\ x = 5 \: and \: ( - 4)$