Question

${4x }^{2} + 17x + 15$
factorisation​

Answer 1

solution

a + b = 17

ab = 4 × 15 = 60

1 , 60

2 , 30

3 , 20

4 , 15

5 , 12

6 , 10

1 + 60 = 61

2 + 30 = 32

3 + 20 = 23

4 + 15 = 19

5 + 12 = 17

6 + 10 = 16

a = 5

b = 12

( 4x ² + 5x ) + ( 12x + 15 )

x ( 4x² + 5x ) + ( 12x + 15

( 4x + 5 ) ( x + 3 )