Question

(5x² - 7x)+(9-2x-15x²)​

Answer 1

Answer:

3/5 or -3/2

Step-by-step explanation:

first open the bracket

5x² - 7x + 9 - 2x - 15x²

rearrange and equate

5x² - 15x² - 7x -2x + 9 =

-10x² - 9x + 9

multiply with minus

-( -10x² - 9x + 9 ) =

10x² + 9x - 9

split the middle term

10x² + 15x - 6x - 9

now group the first and last 2 terms

5x (2x + 3) -3 (2x + 3)

(5x - 3) and (2x + 3)

x = 3/5 or x = -3/2