Question

(2x2 + 5x) (2x2 + 5x - 19) + 84​

Answer 1

Step-by-step explanation:

Let 2x² + 5x = a

×××××××××××××××

(a) (a - 19) + 84

a² - 19a + 84

a² - (12 + 7)a + 84

a² - 12a - 7a + 84

a(a - 12) - 7(a - 12)

(a - 12)(a - 7)

(2x² + 5x - 12)(2x² + 5x - 7)

[ 2x² + (8 - 3)x - 12] [ 2x² + (7 - 2)x - 7]

[ 2x² + 8x - 3x - 12] [ 2x² + 7x - 2x - 7]

[ 2x(x + 4) - 3(x + 4)] [ x(2x + 7) -1(2x + 7)]

(x + 4)(2x - 3)(2x + 7)(x - 1)

I hope this will help you

Answer 2

Answer:

25x^2+ + 20x -51

Step-by-step explanation:

(5x + 4)(5x - 15) + 84

5x( 5x - 15 ) + 4( 5x - 15)

25x^2 -75 +20x -60 +84

25x^2 + 20x -51