Question

3(5x-3)(x-7)+12=(x-8)(x-7)+14x²-7x+20

Answer 1

3 (5x - 3) (x - 7) + 12 = (x -8) (x -7) + 14x² - 7x + 20

(15x - 9) (x - 7) + 12 = x² - 7x - 8x + 56 + 14x² - 7x + 20

15x² - 105x - 9x + 63 + 12 = 15x² - 22x + 76

15x² - 114x + 75 = 15x² - 22x + 76

15x² - 15x² - 114x + 22x = 76 - 75

-92x = 1

92x = -1

x = - 1/92